    /**
     * @author Ed Spencer
     *
     * A Model represents some object that your application manages. For example, one might define a Model for Users,
     * Products, Cars, or any other real-world object that we want to model in the system. Models are registered via the
     * {@link Ext.ModelManager model manager}, and are used by {@link Ext.data.Store stores}, which are in turn used by many
     * of the data-bound components in Ext.
     *
     * Models are defined as a set of fields and any arbitrary methods and properties relevant to the model. For example:
     *
     *     Ext.define('User', {
     *         extend: 'Ext.data.Model',
     *         fields: [
     *             {name: 'name',  type: 'string'},
     *             {name: 'age',   type: 'int', convert: null},
     *             {name: 'phone', type: 'string'},
     *             {name: 'alive', type: 'boolean', defaultValue: true, convert: null}
     *         ],
     *
     *         changeName: function() {
     *             var oldName = this.get('name'),
     *                 newName = oldName + " The Barbarian";
     *
     *             this.set('name', newName);
     *         }
     *     });
     *
     * The fields array is turned into a {@link Ext.util.MixedCollection MixedCollection} automatically by the {@link
     * Ext.ModelManager ModelManager}, and all other functions and properties are copied to the new Model's prototype.
     *
     * A Model definition always has an *identifying field* which should yield a unique key for each instance. By default, a field
     * named "id" will be created with a {@link Ext.data.Field#mapping mapping} of "id". This happens because of the default
     * {@link #idProperty} provided in Model definitions.
     *
     * To alter which field is the identifying field, use the {@link #idProperty} config.
     *
     * If the Model should not have any identifying field (for example if you are defining ab abstract base class for your
     * application models), configure the {@liknk #idProperty} as `null`.
     *
     * By default, the built in numeric and boolean field types have a {@link Ext.data.Field#convert} function which coerces string
     * values in raw data into the field's type. For better performance with {@link Ext.data.reader.Json Json} or {@link Ext.data.reader.Array Array}
     * readers *if you are in control of the data fed into this Model*, you can null out the default convert function which will cause
     * the raw property to be copied directly into the Field's value.
     *
     * Now we can create instances of our User model and call any model logic we defined:
     *
     *     var user = Ext.create('User', {
     *         id   : 'ABCD12345',
     *         name : 'Conan',
     *         age  : 24,
     *         phone: '555-555-5555'
     *     });
     *
     *     user.changeName();
     *     user.get('name'); //returns "Conan The Barbarian"
     *
     * # Validations
     *
     * Models have built-in support for validations, which are executed against the validator functions in {@link
     * Ext.data.validations} ({@link Ext.data.validations see all validation functions}). Validations are easy to add to
     * models:
     *
     *     Ext.define('User', {
     *         extend: 'Ext.data.Model',
     *         fields: [
     *             {name: 'name',     type: 'string'},
     *             {name: 'age',      type: 'int'},
     *             {name: 'phone',    type: 'string'},
     *             {name: 'gender',   type: 'string'},
     *             {name: 'username', type: 'string'},
     *             {name: 'alive',    type: 'boolean', defaultValue: true}
     *         ],
     *
     *         validations: [
     *             {type: 'presence',  field: 'age'},
     *             {type: 'length',    field: 'name',     min: 2},
     *             {type: 'inclusion', field: 'gender',   list: ['Male', 'Female']},
     *             {type: 'exclusion', field: 'username', list: ['Admin', 'Operator']},
     *             {type: 'format',    field: 'username', matcher: /([a-z]+)[0-9]{2,3}/}
     *         ]
     *     });
     *
     * The validations can be run by simply calling the {@link #validate} function, which returns a {@link Ext.data.Errors}
     * object:
     *
     *     var instance = Ext.create('User', {
     *         name: 'Ed',
     *         gender: 'Male',
     *         username: 'edspencer'
     *     });
     *
     *     var errors = instance.validate();
     *
     * # Associations
     *
     * Models can have associations with other Models via {@link Ext.data.association.HasOne},
     * {@link Ext.data.association.BelongsTo belongsTo} and {@link Ext.data.association.HasMany hasMany} associations.
     * For example, let's say we're writing a blog administration application which deals with Users, Posts and Comments.
     * We can express the relationships between these models like this:
     *
     *     Ext.define('Post', {
     *         extend: 'Ext.data.Model',
     *         fields: ['id', 'user_id'],
     *
     *         belongsTo: 'User',
     *         hasMany  : {model: 'Comment', name: 'comments'}
     *     });
     *
     *     Ext.define('Comment', {
     *         extend: 'Ext.data.Model',
     *         fields: ['id', 'user_id', 'post_id'],
     *
     *         belongsTo: 'Post'
     *     });
     *
     *     Ext.define('User', {
     *         extend: 'Ext.data.Model',
     *         fields: ['id'],
     *
     *         hasMany: [
     *             'Post',
     *             {model: 'Comment', name: 'comments'}
     *         ]
     *     });
     *
     * See the docs for {@link Ext.data.association.HasOne}, {@link Ext.data.association.BelongsTo} and
     * {@link Ext.data.association.HasMany} for details on the usage and configuration of associations.
     * Note that associations can also be specified like this:
     *
     *     Ext.define('User', {
     *         extend: 'Ext.data.Model',
     *         fields: ['id'],
     *
     *         associations: [
     *             {type: 'hasMany', model: 'Post',    name: 'posts'},
     *             {type: 'hasMany', model: 'Comment', name: 'comments'}
     *         ]
     *     });
     *
     * # Using a Proxy
     *
     * Models are great for representing types of data and relationships, but sooner or later we're going to want to load or
     * save that data somewhere. All loading and saving of data is handled via a {@link Ext.data.proxy.Proxy Proxy}, which
     * can be set directly on the Model:
     *
     *     Ext.define('User', {
     *         extend: 'Ext.data.Model',
     *         fields: ['id', 'name', 'email'],
     *
     *         proxy: {
     *             type: 'rest',
     *             url : '/users'
     *         }
     *     });
     *
     * Here we've set up a {@link Ext.data.proxy.Rest Rest Proxy}, which knows how to load and save data to and from a
     * RESTful backend. Let's see how this works:
     *
     *     var user = Ext.create('User', {name: 'Ed Spencer', email: 'ed@sencha.com'});
     *
     *     user.save(); //POST /users
     *
     * Calling {@link #save} on the new Model instance tells the configured RestProxy that we wish to persist this Model's
     * data onto our server. RestProxy figures out that this Model hasn't been saved before because it doesn't have an id,
     * and performs the appropriate action - in this case issuing a POST request to the url we configured (/users). We
     * configure any Proxy on any Model and always follow this API - see {@link Ext.data.proxy.Proxy} for a full list.
     *
     * Loading data via the Proxy is equally easy:
     *
     *     //get a reference to the User model class
     *     var User = Ext.ModelManager.getModel('User');
     *
     *     //Uses the configured RestProxy to make a GET request to /users/123
     *     User.load(123, {
     *         success: function(user) {
     *             console.log(user.getId()); //logs 123
     *         }
     *     });
     *
     * Models can also be updated and destroyed easily:
     *
     *     //the user Model we loaded in the last snippet:
     *     user.set('name', 'Edward Spencer');
     *
     *     //tells the Proxy to save the Model. In this case it will perform a PUT request to /users/123 as this Model already has an id
     *     user.save({
     *         success: function() {
     *             console.log('The User was updated');
     *         }
     *     });
     *
     *     //tells the Proxy to destroy the Model. Performs a DELETE request to /users/123
     *     user.destroy({
     *         success: function() {
     *             console.log('The User was destroyed!');
     *         }
     *     });
     *
     * # Usage in Stores
     *
     * It is very common to want to load a set of Model instances to be displayed and manipulated in the UI. We do this by
     * creating a {@link Ext.data.Store Store}:
     *
     *     var store = Ext.create('Ext.data.Store', {
     *         model: 'User'
     *     });
     *
     *     //uses the Proxy we set up on Model to load the Store data
     *     store.load();
     *
     * A Store is just a collection of Model instances - usually loaded from a server somewhere. Store can also maintain a
     * set of added, updated and removed Model instances to be synchronized with the server via the Proxy. See the {@link
     * Ext.data.Store Store docs} for more information on Stores.
     */
    Ext.define('Ext.data.Model', {
        alternateClassName: 'Ext.data.Record',

        mixins: {
            observable: 'Ext.util.Observable'
        },

        requires: [
            'Ext.ModelManager',
            'Ext.data.IdGenerator',
            'Ext.data.Field',
            'Ext.data.Errors',
            'Ext.data.Operation',
            'Ext.data.validations',
            'Ext.util.MixedCollection'
        ],

        compareConvertFields: function(f1, f2) {
            var f1SpecialConvert = f1.convert && f1.type && f1.convert !== f1.type.convert,
                f2SpecialConvert = f2.convert && f2.type && f2.convert !== f2.type.convert;

            if (f1SpecialConvert && !f2SpecialConvert) {
                return 1;
            }

            if (!f1SpecialConvert && f2SpecialConvert) {
                return -1;
            }
            return 0;
        },

        itemNameFn: function(item) {
            return item.name;
        },

        onClassExtended: function(cls, data, hooks) {
            var onBeforeClassCreated = hooks.onBeforeCreated;

            hooks.onBeforeCreated = function(cls, data) {
                var me = this,
                    name = Ext.getClassName(cls),
                    prototype = cls.prototype,
                    superCls = cls.prototype.superclass,

                    validations = data.validations || [],
                    fields = data.fields || [],
                    field,
                    associationsConfigs = data.associations || [],
                    addAssociations = function(items, type) {
                        var i = 0,
                            len,
                            item;

                        if (items) {
                            items = Ext.Array.from(items);

                            for (len = items.length; i < len; ++i) {
                                item = items[i];

                                if (!Ext.isObject(item)) {
                                    item = {model: item};
                                }

                                item.type = type;
                                associationsConfigs.push(item);
                            }
                        }
                    },
                    idgen = data.idgen,

                    fieldsMixedCollection = new Ext.util.MixedCollection(false, prototype.itemNameFn),

                    associationsMixedCollection = new Ext.util.MixedCollection(false, prototype.itemNameFn),

                    superValidations = superCls.validations,
                    superFields = superCls.fields,
                    superAssociations = superCls.associations,

                    associationConfig, i, ln,
                    dependencies = [],

                    // Use the idProperty from the configuration if there is one, else fall back to the default from the prototype
                    idProperty = 'idProperty' in data ? data.idProperty : prototype.idProperty,

                    // If an idProperty was specified, we create an idField
                    idField = idProperty ? (idProperty.isField ? idProperty : new Ext.data.Field(idProperty)) : null,

                    // Set if there is a Field in the defined fields which encapsulates the idProperty
                    idFieldDefined = false,

                    // Process each Field upon add into the collection
                    onFieldAddReplace = function(arg0, arg1, arg2) {
                        var newField,
                            pos;

                        if (fieldsMixedCollection.events.add.firing) {
                            // Add event signature is (position, value, key);
                            pos = arg0;
                            newField  = arg1;
                        } else {
                            // Replace event signature is (key, oldValue, newValue);
                            newField = arg2;
                            pos = arg1.originalIndex;
                        }

                        // Set the originalIndex for ArrayReader to get the default mapping from in case
                        // compareConvertFields changes the order due to some fields having custom convert functions.
                        newField.originalIndex = pos;

                        // If a defined Field encapsulates the idProperty, then we do not have to create a separate identifying field.
                        // Also, this field must never have a default value set if no value arrives from the server side.
                        // So override any possible prototype-provided defaultValue with undefined which will inhibit generation of defaulting code in Reader.buildRecordDataExtractor
                        if (idField && ((newField.mapping && (newField.mapping === idField.mapping)) || (newField.name === idField.name))) {
                            prototype.idField = newField;
                            idFieldDefined = true;
                            newField.defaultValue = undefined;
                        }
                    },

                    // The configured Proxy if any. If there is none, we may inherit one from the superclass, or fall back to the defaultProxyType
                    clsProxy = data.proxy,

                    // Sort upon add function to be used in case of dynamically added Fields
                    fieldConvertSortFn = function() {
                        fieldsMixedCollection.sortBy(prototype.compareConvertFields);
                    };

                // Save modelName on class and its prototype
                cls.modelName = name;
                prototype.modelName = name;

                // Merge the validations of the superclass and the new subclass
                if (superValidations) {
                    validations = superValidations.concat(validations);
                }

                data.validations = validations;

                // Merge the fields of the superclass and the new subclass
                if (superFields) {
                    fields = superFields.items.concat(fields);
                }

                fieldsMixedCollection.on({
                    add:     onFieldAddReplace,
                    replace: onFieldAddReplace
                });

                for (i = 0, ln = fields.length; i < ln; ++i) {
                    field = fields[i];
                    fieldsMixedCollection.add(field.isField ? field : new Ext.data.Field(field));
                }

                // If there was an idProperty specified, and there has *not* been a field defined which encapsulates that property,
                // then create a field which encapsulates that property.
                // This must never provide a default value.
                if (idField && !idFieldDefined) {
                    prototype.idField = idField;
                    idField.defaultValue = undefined;
                    fieldsMixedCollection.add(idField);
                }

                // Ensure the Fields are on correct order: Fields with custom convert function last
                fieldConvertSortFn();
                fieldsMixedCollection.on({
                    add:     fieldConvertSortFn,
                    replace: fieldConvertSortFn
                });

                data.fields = fieldsMixedCollection;

                if (idgen) {
                    data.idgen = Ext.data.IdGenerator.get(idgen);
                }

                //associations can be specified in the more convenient format (e.g. not inside an 'associations' array).
                //we support that here
                addAssociations(data.belongsTo, 'belongsTo');
                delete data.belongsTo;
                addAssociations(data.hasMany, 'hasMany');
                delete data.hasMany;
                addAssociations(data.hasOne, 'hasOne');
                delete data.hasOne;

                if (superAssociations) {
                    associationsConfigs = superAssociations.items.concat(associationsConfigs);
                }

                for (i = 0, ln = associationsConfigs.length; i < ln; ++i) {
                    dependencies.push('association.' + associationsConfigs[i].type.toLowerCase());
                }

                // If we have been configured with a proxy *configuration* (not a full Proxy), push it onto our dependency requirements
                if (clsProxy) {
                    if (!clsProxy.isProxy) {
                        dependencies.push('proxy.' + (clsProxy.type || clsProxy));
                    }
                }
                // Not inheriting a proxy, push the defaultProxyType onto our dependency requirements, and set the
                // proxy type for instantiation later.
                else if (!cls.prototype.proxy) {
                    cls.prototype.proxy = cls.prototype.defaultProxyType;
                    dependencies.push('proxy.' + cls.prototype.defaultProxyType);
                }

                Ext.require(dependencies, function() {
                    Ext.ModelManager.registerType(name, cls);

                    for (i = 0, ln = associationsConfigs.length; i < ln; ++i) {
                        associationConfig = associationsConfigs[i];
                        if (associationConfig.isAssociation) {
                            associationConfig = Ext.applyIf({
                                ownerModel: name,
                                associatedModel: associationConfig.model
                            }, associationConfig.initialConfig);
                        } else {
                            Ext.apply(associationConfig, {
                                ownerModel: name,
                                associatedModel: associationConfig.model
                            });
                        }

                        if (Ext.ModelManager.getModel(associationConfig.model) === undefined) {
                            Ext.ModelManager.registerDeferredAssociation(associationConfig);
                        } else {
                            associationsMixedCollection.add(Ext.data.association.Association.create(associationConfig));
                        }
                    }

                    data.associations = associationsMixedCollection;

                    // onBeforeCreated may get called *asynchronously* if any of those required classes caused
                    // an asynchronous script load. This would mean that the class definition object
                    // has not been applied to the prototype when the Model definition has returned.
                    // The Reader constructor does not attempt to buildExtractors if the fields MixedCollection
                    // has not yet been set. The cls.setProxy call triggers a build of extractor methods.
                    onBeforeClassCreated.call(me, cls, data, hooks);

                    // If we have been configured with an instantiated proxy, set it now.
                    if (clsProxy && clsProxy.isProxy) {
                        cls.setProxy(clsProxy);
                    }

                    // Fire the onModelDefined template method on ModelManager
                    Ext.ModelManager.onModelDefined(cls);
                });
            };
        },

        inheritableStatics: {
            /**
             * Sets the Proxy to use for this model. Accepts any options that can be accepted by
             * {@link Ext#createByAlias Ext.createByAlias}.
             * @param {String/Object/Ext.data.proxy.Proxy} proxy The proxy
             * @return {Ext.data.proxy.Proxy}
             * @static
             * @inheritable
             */
            setProxy: function(proxy) {
                //make sure we have an Ext.data.proxy.Proxy object
                if (!proxy.isProxy) {
                    if (typeof proxy == "string") {
                        proxy = {
                            type: proxy
                        };
                    }
                    proxy = Ext.createByAlias("proxy." + proxy.type, proxy);
                }
                proxy.setModel(this);
                this.proxy = this.prototype.proxy = proxy;

                return proxy;
            },

            /**
             * Returns the configured Proxy for this Model
             * @return {Ext.data.proxy.Proxy} The proxy
             * @static
             * @inheritable
             */
            getProxy: function() {

                var proxy = this.proxy;

                // Not yet been created wither from prototype property set in onClassExtended, or by cloning superclass's Proxy...
                if (!proxy) {
                    proxy = this.prototype.proxy;

                    // If we inherited an instantiated Propxy, we can't share it, so clone it.
                    if (proxy.isProxy) {
                        proxy = proxy.clone()
                    }

                    return this.setProxy(proxy);
                }

                return proxy;
            },

            /**
             * Apply a new set of field and/or property definitions to the existing model. This will replace any existing
             * fields, including fields inherited from superclasses. Mainly for reconfiguring the
             * model based on changes in meta data (called from Reader's onMetaChange method).
             * @static
             * @inheritable
             */
            setFields: function(fields, idProperty, clientIdProperty) {
                var me = this,
                    newField,
                    idField,
                    idFieldDefined = false,
                    proto = me.prototype,
                    prototypeFields = proto.fields,
                    superFields = proto.superclass.fields,
                    len,
                    i;

                if (idProperty) {
                    proto.idProperty = idProperty;
                    idField = idProperty.isField ? idProperty : new Ext.data.Field(idProperty);

                }
                if (clientIdProperty) {
                    proto.clientIdProperty = clientIdProperty;
                }

                if (prototypeFields) {
                    prototypeFields.clear();
                }
                else {
                    prototypeFields = me.prototype.fields = new Ext.util.MixedCollection(false, function(field) {
                        return field.name;
                    });
                }

                // Merge the fields of the superclass and the passed in fields
                if (superFields) {
                    fields = superFields.items.concat(fields);
                }

                for (i = 0, len = fields.length; i < len; i++) {
                    newField = new Ext.data.Field(fields[i]);

                    // If a defined Field encapsulates the idProperty, then we do not have to create a separate identifying field.
                    // Also, this field must never have a default value set if no value arrives from the server side.
                    // So override any possible prototype-provided defaultValue with undefined which will inhibit generation of defaulting code in Reader.buildRecordDataExtractor
                    if (idField && ((newField.mapping && (newField.mapping === idField.mapping)) || (newField.name === idField.name))) {
                        idFieldDefined = true;
                        newField.defaultValue = undefined;
                    }
                    prototypeFields.add(newField);
                }

                // If there was an idProperty specified, and there has *not* been a field defined which encapsulates that property,
                // then create a field which encapsulates that property.
                // This must never provide a default value.
                if (idField && !idFieldDefined) {
                    idField.defaultValue = undefined;
                    prototypeFields.add(idField);
                }

                me.fields = prototypeFields;

                return prototypeFields;
            },

            /**
             * Returns an Array of {@link Ext.data.Field Field} definitions which define this Model's structure
             *
             * Fields are sorted upon Model class definition. Fields with custom {@link Ext.data.Field#convert convert} functions
             * are moved to *after* fields with no convert functions. This is so that convert functions which rely on existing
             * field values will be able to read those field values.
             *
             * @return {Ext.data.Field[]} The defined Fields for this Model.
             *
             */
            getFields: function() {
                return this.prototype.fields.items;
            },

            /**
             * Asynchronously loads a model instance by id. Sample usage:
             *
             *     Ext.define('MyApp.User', {
             *         extend: 'Ext.data.Model',
             *         fields: [
             *             {name: 'id', type: 'int'},
             *             {name: 'name', type: 'string'}
             *         ]
             *     });
             *
             *     MyApp.User.load(10, {
             *         scope: this,
             *         failure: function(record, operation) {
             *             //do something if the load failed
             *             //record is null
             *         },
             *         success: function(record, operation) {
             *             //do something if the load succeeded
             *         },
             *         callback: function(record, operation, success) {
             *             //do something whether the load succeeded or failed
             *             //if operation is unsuccessful, record is null
             *         }
             *     });
             *
             * @param {Number/String} id The id of the model to load
             * @param {Object} config (optional) config object containing success, failure and callback functions, plus
             * optional scope
             * @static
             * @inheritable
             */
            load: function(id, config) {
                config = Ext.apply({}, config);
                config = Ext.applyIf(config, {
                    action: 'read',
                    id    : id
                });

                var operation  = new Ext.data.Operation(config),
                    scope      = config.scope || this,
                    callback;

                callback = function(operation) {
                    var record = null,
                        success = operation.wasSuccessful();

                    if (success) {
                        record = operation.getRecords()[0];
                        // If the server didn't set the id, do it here
                        if (!record.hasId()) {
                            record.setId(id);
                        }
                        Ext.callback(config.success, scope, [record, operation]);
                    } else {
                        Ext.callback(config.failure, scope, [record, operation]);
                    }
                    Ext.callback(config.callback, scope, [record, operation, success]);
                };

                this.getProxy().read(operation, callback, this);
            }
        },

        statics: {
            /**
             * @property
             * @static
             * @private
             */
            PREFIX : 'ext-record',
            /**
             * @property
             * @static
             * @private
             */
            AUTO_ID: 1,
            /**
             * @property
             * @static
             * The update operation of type 'edit'. Used by {@link Ext.data.Store#event-update Store.update} event.
             */
            EDIT   : 'edit',
            /**
             * @property
             * @static
             * The update operation of type 'reject'. Used by {@link Ext.data.Store#event-update Store.update} event.
             */
            REJECT : 'reject',
            /**
             * @property
             * @static
             * The update operation of type 'commit'. Used by {@link Ext.data.Store#event-update Store.update} event.
             */
            COMMIT : 'commit',

            /**
             * Generates a sequential id. This method is typically called when a record is {@link Ext#create
             * create}d and {@link #constructor no id has been specified} either as a parameter, or through the {@link #idProperty}
             * in the passed data. The generated id will automatically be assigned to the
             * record. The returned id takes the form: {PREFIX}-{AUTO_ID}.
             *
             * - **PREFIX** : String - Ext.data.Model.PREFIX (defaults to 'ext-record')
             * - **AUTO_ID** : String - Ext.data.Model.AUTO_ID (defaults to 1 initially)
             *
             * @param {Ext.data.Model} rec The record being created. The record does not exist, it's a {@link #phantom}.
             * @return {String} auto-generated string id, `"ext-record-i++"`;
             * @static
             */
            id: function(rec) {
                var id = [this.PREFIX, '-', this.AUTO_ID++].join('');
                rec.phantom = true;
                rec.internalId = id;
                return id;
            }
        },

        /**
         * @cfg {String/Object} idgen
         * The id generator to use for this model. The default id generator does not generate
         * values for the {@link #idProperty}.
         *
         * This can be overridden at the model level to provide a custom generator for a model.
         * The simplest form of this would be:
         *
         *      Ext.define('MyApp.data.MyModel', {
         *          extend: 'Ext.data.Model',
         *          requires: ['Ext.data.SequentialIdGenerator'],
         *          idgen: 'sequential',
         *          ...
         *      });
         *
         * The above would generate {@link Ext.data.SequentialIdGenerator sequential} id's such
         * as 1, 2, 3 etc..
         *
         * Another useful id generator is {@link Ext.data.UuidGenerator}:
         *
         *      Ext.define('MyApp.data.MyModel', {
         *          extend: 'Ext.data.Model',
         *          requires: ['Ext.data.UuidGenerator'],
         *          idgen: 'uuid',
         *          ...
         *      });
         *
         * An id generation can also be further configured:
         *
         *      Ext.define('MyApp.data.MyModel', {
         *          extend: 'Ext.data.Model',
         *          idgen: {
         *              type: 'sequential',
         *              seed: 1000,
         *              prefix: 'ID_'
         *          }
         *      });
         *
         * The above would generate id's such as ID_1000, ID_1001, ID_1002 etc..
         *
         * If multiple models share an id space, a single generator can be shared:
         *
         *      Ext.define('MyApp.data.MyModelX', {
         *          extend: 'Ext.data.Model',
         *          idgen: {
         *              type: 'sequential',
         *              id: 'xy'
         *          }
         *      });
         *
         *      Ext.define('MyApp.data.MyModelY', {
         *          extend: 'Ext.data.Model',
         *          idgen: {
         *              type: 'sequential',
         *              id: 'xy'
         *          }
         *      });
         *
         * For more complex, shared id generators, a custom generator is the best approach.
         * See {@link Ext.data.IdGenerator} for details on creating custom id generators.
         *
         * @markdown
         */
        idgen: {
            isGenerator: true,
            type: 'default',

            generate: function () {
                return null;
            },
            getRecId: function (rec) {
                return rec.modelName + '-' + rec.internalId;
            }
        },

        /**
         * @property {Boolean} editing
         * Internal flag used to track whether or not the model instance is currently being edited.
         * @readonly
         */
        editing : false,

        /**
         * @property {Boolean} dirty
         * True if this Record has been modified.
         * @readonly
         */
        dirty : false,

        /**
         * @cfg {String} persistenceProperty
         * The name of the property on this Persistable object that its data is saved to. Defaults to 'data'
         * (i.e: all persistable data resides in `this.data`.)
         * @deprecated This config is deprecated. In future this will no longer be configurable and will be data.
         */
        persistenceProperty: 'data',

        evented: false,

        /**
         * @property {Boolean} isModel
         * `true` in this class to identify an object as an instantiated Model, or subclass thereof.
         */
        isModel: true,

        /**
         * @property {Boolean} phantom
         * True when the record does not yet exist in a server-side database (see {@link #setDirty}).
         * Any record which has a real database pk set as its id property is NOT a phantom -- it's real.
         */
        phantom : false,

        /**
         * @cfg {String/Object/Ext.data.Field} idProperty
         * The name of the field treated as this Model's unique id. Defaults to 'id'.
         *
         * This may also be specified as a Field config object. This means that the identifying field can be calculated
         * using a {@link Ext.data.Field#convert convert} function which might aggregate several values from the
         * raw data object to use as an identifier.
         *
         * The resulting {@link Ext.data.Field Field} is added to the Model's field collection unless there is already
         * a configured field with a mapping that reads the same property.
         *
         * If defining an **abstract** base Model class, the `idProperty` may be configured as `null` which will mean that
         * no identifying field will be generated.
         */
        idProperty: 'id',

        /**
         * @cfg {String} [clientIdProperty]
         * The name of a property that is used for submitting this Model's unique client-side identifier
         * to the server when multiple phantom records are saved as part of the same {@link Ext.data.Operation Operation}.
         * In such a case, the server response should include the client id for each record
         * so that the server response data can be used to update the client-side records if necessary.
         * This property cannot have the same name as any of this Model's fields.
         */
        clientIdProperty: null,

        /**
         * @cfg {String} defaultProxyType
         * The string type of the default Model Proxy. Defaults to 'ajax'.
         */
        defaultProxyType: 'ajax',

        // Used as a dummy source array when constructor is called with no args
        emptyData: [],

        // Fields config and property
        /**
         * @cfg {Object[]/String[]} fields
         * The fields for this model. This is an Array of **{@link Ext.data.Field Field}** definition objects. A Field
         * definition may simply be the *name* of the Field, but a Field encapsulates {@link Ext.data.Field#type data type},
         * {@link Ext.data.Field#convert custom conversion} of raw data, and a {@link Ext.data.Field#mapping mapping}
         * property to specify by name of index, how to extract a field's value from a raw data object, so it is best practice
         * to specify a full set of {@link Ext.data.Field Field} config objects.
         */
        /**
         * @property {Ext.util.MixedCollection} fields
         * A {@link Ext.util.MixedCollection Collection} of the fields defined for this Model (including fields defined in superclasses)
         *
         * This is a collection of {@link Ext.data.Field} instances, each of which encapsulates information that the field was configured with.
         * By default, you can specify a field as simply a String, representing the *name* of the field, but a Field encapsulates
         * {@link Ext.data.Field#type data type}, {@link Ext.data.Field#convert custom conversion} of raw data, and a {@link Ext.data.Field#mapping mapping}
         * property to specify by name of index, how to extract a field's value from a raw data object.
         */

        /**
         * @cfg {Object[]} validations
         * An array of {@link Ext.data.validations validations} for this model.
         */

        // Associations configs and properties
        /**
         * @cfg {Object[]} associations
         * An array of {@link Ext.data.Association associations} for this model.
         */
        /**
         * @cfg {String/Object/String[]/Object[]} hasMany
         * One or more {@link Ext.data.HasManyAssociation HasMany associations} for this model.
         */
        /**
         * @cfg {String/Object/String[]/Object[]} belongsTo
         * One or more {@link Ext.data.BelongsToAssociation BelongsTo associations} for this model.
         */
        /**
         * @cfg {String/Object/Ext.data.proxy.Proxy} proxy
         * The {@link Ext.data.proxy.Proxy proxy} to use for this model.
         */

        /**
         * @event idchanged
         * Fired when this model's id changes
         * @param {Ext.data.Model} this
         * @param {Number/String} oldId The old id
         * @param {Number/String} newId The new id
         */

        /**
         * Creates new Model instance.
         * @param {Object} data An object containing keys corresponding to this model's fields, and their associated values
         */
        constructor: function(data, id, raw, convertedData) {
            // id, raw and convertedData not documented intentionally, meant to be used internally.
            // TODO: find where "raw" is used and remove it. The first parameter, "data" is raw, unconverted data.
            //
            // The "convertedData" parameter is a converted object hash with all properties corresponding to defined Fields
            // and all values of the defined type. It is used directly as this record's data property.
            // When the convertedData parameter is used, raw data is passed in using the "raw" parameter and
            // is not processed

            var me = this,
                passedId = (id || id === 0),
                hasId,
                fields,
                length,
                field,
                name,
                value,
                newId,
                persistenceProperty,
                idProperty = me.idProperty,
                idField = me.idField,
                i;

            /**
             * @property {Object} raw The raw data used to create this model if created via a reader.
             */
            me.raw = raw || data; // If created using data in constructor, use data

            /**
             * @property {Object} modified Key: value pairs of all fields whose values have changed
             */
            me.modified = {};

            //<debug>
            // exclude types since it's new
            if (me.persistenceProperty !== 'data') {
                Ext.log.warn(this.$className, 'The persistenceProperty will be deprecated, all data will be stored in the underlying data property.');
            }
            //</debug>
            persistenceProperty = me[me.persistenceProperty] = convertedData || {};

            // Until persistenceProperty is deprecated, keep a reference in me.data
            me.data = me[me.persistenceProperty];

            me.mixins.observable.constructor.call(me);

            if (!convertedData) {

                if (data) {
                    // If no ID passed, use the id property from the converted data
                    if (!passedId && idProperty) {
                        id = data[idProperty];
                        hasId = (id || id === 0);
                    }
                }
                // No data passed. Use the static empty array.
                else {
                    data = me.emptyData;
                }

                //add default field values if present
                fields = me.fields.items;
                length = fields.length;
                i = 0;

                if (Ext.isArray(data)) {
                    for (; i < length; i++) {
                        field = fields[i];
                        name  = field.name;

                        // Use the original ordinal position at which the Model inserted the field into its collection.
                        // Fields are sorted to place fields with a *convert* function last.
                        value = data[field.originalIndex];

                        if (value === undefined) {
                            value = field.defaultValue;
                        }
                        // Have to map array data so the values get assigned to the named fields
                        // rather than getting set as the field names with undefined values.
                        if (field.convert) {
                            value = field.convert(value, me);
                        }
                        // On instance construction, do not create data properties based on undefined input properties
                        if (value !== undefined) {
                            persistenceProperty[name] = value;
                        }
                    }

                } else {
                   for (; i < length; i++) {
                        field = fields[i];
                        name  = field.name;
                        value = data[name];
                        if (value === undefined) {
                            value = field.defaultValue;
                        }
                        if (field.convert) {
                            value = field.convert(value, me);
                        }
                        // On instance construction, do not create data properties based on undefined input properties
                        if (value !== undefined) {
                            persistenceProperty[name] = value;
                        }
                   }
                }
            }

            /**
             * @property {Ext.data.Store[]} stores
             * The {@link Ext.data.Store Stores} to which this instance is bound.
             */
            me.stores = [];

            // Caller passed an id, put the converted value into our data object.
            // The *unconverted* value is used as the internalId.
            if (passedId) {
                hasId = true;
                persistenceProperty[idProperty] = idField && idField.convert ? idField.convert(id) : id;
            }

            // If there's no id, we are a phantom so we have to generate an id.
            else if (!hasId) {
                // Generate a key using the supplied idgen function
                newId = me.idgen.generate();
                if (newId != null) {
                    me.preventInternalUpdate = true;
                    me.setId(newId);
                    delete me.preventInternalUpdate;
                }
            }

            /**
             * @property {Number/String} internalId
             * An internal unique ID for each Model instance, used to identify Models that don't have an ID yet
             * @private
             */
            me.internalId = hasId ? id : Ext.data.Model.id(me);
            // The Ext.data.Model.id call sets the phantom property. So it will be set now if !hasId

            if (typeof me.init == 'function') {
                me.init();
            }

            // Generate an observable ID
            me.id = me.idgen.getRecId(me);
        },

        /**
         * Returns the value of the given field
         * @param {String} fieldName The field to fetch the value for
         * @return {Object} The value
         */
        get: function(field) {
            return this[this.persistenceProperty][field];
        },

        // This object is used whenever the set() method is called and given a string as the
        // first argument. This approach saves memory (and GC costs) since we could be called
        // a lot.
        _singleProp: {},

        /**
         * Sets the given field to the given value, marks the instance as dirty
         * @param {String/Object} fieldName The field to set, or an object containing key/value pairs
         * @param {Object} newValue The value to set
         * @return {String[]} The array of modified field names or null if nothing was modified.
         */
        set: function (fieldName, newValue) {
            var me = this,
                data = me[me.persistenceProperty],
                fields = me.fields,
                modified = me.modified,
                single = (typeof fieldName == 'string'),
                currentValue, field, idChanged, key, modifiedFieldNames, name, oldId,
                newId, value, values;

            if (single) {
                values = me._singleProp;
                values[fieldName] = newValue;
            } else {
                values = fieldName;
            }

            for (name in values) {
                if (values.hasOwnProperty(name)) {
                    value = values[name];

                    if (fields && (field = fields.get(name)) && field.convert) {
                        value = field.convert(value, me);
                    }

                    currentValue = data[name];
                    if (me.isEqual(currentValue, value)) {
                        continue; // new value is the same, so no change...
                    }

                    data[name] = value;
                    (modifiedFieldNames || (modifiedFieldNames = [])).push(name);

                    if (field && field.persist) {
                        if (modified.hasOwnProperty(name)) {
                            if (me.isEqual(modified[name], value)) {
                                // The original value in me.modified equals the new value, so
                                // the field is no longer modified:
                                delete modified[name];

                                // We might have removed the last modified field, so check to
                                // see if there are any modified fields remaining and correct
                                // me.dirty:
                                me.dirty = false;
                                for (key in modified) {
                                    if (modified.hasOwnProperty(key)){
                                        me.dirty = true;
                                        break;
                                    }
                                }
                            }
                        } else {
                            me.dirty = true;
                            modified[name] = currentValue;
                        }
                    }

                    if (name == me.idProperty) {
                        idChanged = true;
                        oldId = currentValue;
                        newId = value;
                    }
                }
            }

            if (single) {
                // cleanup our reused object for next time... important to do this before
                // we fire any events or call anyone else (like afterEdit)!
                delete values[fieldName];
            }

            if (idChanged) {
                me.changeId(oldId, newId);
            }

            if (!me.editing && modifiedFieldNames) {
                me.afterEdit(modifiedFieldNames);
            }

            return modifiedFieldNames || null;
        },

        /**
         * @private
         * Copies data from the passed record into this record. If the passed record is undefined, does nothing.
         *
         * If this is a phantom record (represented only in the client, with no corresponding database entry), and
         * the source record is not a phantom, then this record acquires the id of the source record.
         *
         * @param {Ext.data.Model} sourceRecord The record to copy data from.
         * @return {String[]} The names of the fields which changed value.
         */
        copyFrom: function(sourceRecord) {
            var me = this,
                fields = me.fields.items,
                fieldCount = fields.length,
                modifiedFieldNames = [],
                field, i = 0,
                myData,
                sourceData,
                idProperty = me.idProperty,
                name,
                value;

            if (sourceRecord) {
                myData = me[me.persistenceProperty];
                sourceData = sourceRecord[sourceRecord.persistenceProperty];
                for (; i < fieldCount; i++) {
                    field = fields[i];
                    name = field.name;

                    // Do not use setters.
                    // Copy returned values in directly from the data object.
                    // Converters have already been called because new Records
                    // have been created to copy from.
                    // This is a direct record-to-record value copy operation.
                    // don't copy the id, we'll do it at the end
                    if (name != idProperty) {
                        value = sourceData[name];

                        // If source property is specified, and value is different
                        // copy field value in and build updatedFields
                        if (value !== undefined && !me.isEqual(myData[name], value)) {
                            myData[name] = value;
                            modifiedFieldNames.push(name);
                        }
                    }
                }

                // If this is a phantom record being updated from a concrete record, copy the ID in.
                if (me.phantom && !sourceRecord.phantom) {
                    // beginEdit to prevent events firing
                    // commit at the end to prevent dirty being set
                    me.beginEdit();
                    me.setId(sourceRecord.getId());
                    me.endEdit(true);
                    me.commit(true);
                }
            }
            return modifiedFieldNames;
        },

        /**
         * Checks if two values are equal, taking into account certain
         * special factors, for example dates.
         * @private
         * @param {Object} a The first value
         * @param {Object} b The second value
         * @return {Boolean} True if the values are equal
         */
        isEqual: function(a, b) {
            // instanceof is ~10 times faster then Ext.isDate. Values here will not be cross-document objects
            if (a instanceof Date && b instanceof Date) {
                return a.getTime() === b.getTime();
            }
            return a === b;
        },

        /**
         * Begins an edit. While in edit mode, no events (e.g.. the `update` event) are relayed to the containing store.
         * When an edit has begun, it must be followed by either {@link #endEdit} or {@link #cancelEdit}.
         */
        beginEdit : function(){
            var me = this,
                key,
                data,
                o;

            if (!me.editing) {
                me.editing = true;
                me.dirtySave = me.dirty;

                o = me[me.persistenceProperty];
                data = me.dataSave = {};
                for (key in o) {
                    if (o.hasOwnProperty(key)) {
                        data[key] = o[key];
                    }
                }

                o = me.modified;
                data = me.modifiedSave = {};
                for (key in o) {
                    if (o.hasOwnProperty(key)) {
                        data[key] = o[key];
                    }
                }
            }
        },

        /**
         * Cancels all changes made in the current edit operation.
         */
        cancelEdit : function(){
            var me = this;
            if (me.editing) {
                me.editing = false;
                // reset the modified state, nothing changed since the edit began
                me.modified = me.modifiedSave;
                me[me.persistenceProperty] = me.dataSave;
                me.dirty = me.dirtySave;
                me.modifiedSave = me.dataSave = me.dirtySave = null;
            }
        },

        /**
         * Ends an edit. If any data was modified, the containing store is notified
         * (ie, the store's `update` event will fire).
         * @param {Boolean} [silent] True to not notify the store of the change
         * @param {String[]} [modifiedFieldNames] Array of field names changed during edit.
         */
        endEdit : function(silent, modifiedFieldNames){
            var me = this,
                dataSave,
                changed;

            silent = silent === true;
            if (me.editing) {
                me.editing = false;
                dataSave = me.dataSave;
                me.modifiedSave = me.dataSave = me.dirtySave = null;
                if (!silent) {
                    if (!modifiedFieldNames) {
                        modifiedFieldNames = me.getModifiedFieldNames(dataSave);
                    }
                    changed = me.dirty || modifiedFieldNames.length > 0;
                    if (changed) {
                        me.afterEdit(modifiedFieldNames);
                    }
                }
            }
        },

        /**
         * Gets the names of all the fields that were modified during an edit
         * @param {Object} [saved] The currently saved data. Defaults to
         * the dataSave property on the object.
         * @private
         * @return {String[]} An array of modified field names
         */
        getModifiedFieldNames: function(saved){
            var me = this,
                data = me[me.persistenceProperty],
                modified = [],
                key;

            saved = saved || me.dataSave;
            for (key in data) {
                if (data.hasOwnProperty(key)) {
                    if (!me.isEqual(data[key], saved[key])) {
                        modified.push(key);
                    }
                }
            }
            return modified;
        },

        /**
         * Gets a hash of only the fields that have been modified since this Model was created or commited.
         * @return {Object}
         */
        getChanges : function(){
            var modified = this.modified,
                changes  = {},
                field;

            for (field in modified) {
                if (modified.hasOwnProperty(field)){
                    changes[field] = this.get(field);
                }
            }

            return changes;
        },

        /**
         * Returns true if the passed field name has been `{@link #modified}` since the load or last commit.
         * @param {String} fieldName {@link Ext.data.Field#name}
         * @return {Boolean}
         */
        isModified : function(fieldName) {
            return this.modified.hasOwnProperty(fieldName);
        },

        /**
         * Marks this **Record** as `{@link #dirty}`. This method is used interally when adding `{@link #phantom}` records
         * to a {@link Ext.data.proxy.Server#writer writer enabled store}.
         *
         * Marking a record `{@link #dirty}` causes the phantom to be returned by {@link Ext.data.Store#getUpdatedRecords}
         * where it will have a create action composed for it during {@link Ext.data.Model#save model save} operations.
         */
        setDirty : function() {
            var me     = this,
                fields = me.fields.items,
                fLen   = fields.length,
                field, name, f;

            me.dirty = true;

            for (f = 0; f < fLen; f++) {
                field = fields[f];

                if (field.persist) {
                    name  = field.name;
                    me.modified[name] = me.get(name);
                }
            }
        },

        //<debug>
        markDirty : function() {
            Ext.log.warn('Ext.data.Model: markDirty has been deprecated. Use setDirty instead.');

            return this.setDirty.apply(this, arguments);
        },
        //</debug>

        /**
         * Usually called by the {@link Ext.data.Store} to which this model instance has been {@link #join joined}. Rejects
         * all changes made to the model instance since either creation, or the last commit operation. Modified fields are
         * reverted to their original values.
         *
         * Developers should subscribe to the {@link Ext.data.Store#event-update} event to have their code notified of reject
         * operations.
         *
         * @param {Boolean} silent (optional) True to skip notification of the owning store of the change.
         * Defaults to false.
         */
        reject : function(silent) {
            var me = this,
                modified = me.modified,
                field;

            for (field in modified) {
                if (modified.hasOwnProperty(field)) {
                    if (typeof modified[field] != "function") {
                        me[me.persistenceProperty][field] = modified[field];
                    }
                }
            }

            me.dirty = false;
            me.editing = false;
            me.modified = {};

            if (silent !== true) {
                me.afterReject();
            }
        },

        /**
         * Usually called by the {@link Ext.data.Store} which owns the model instance. Commits all changes made to the
         * instance since either creation or the last commit operation.
         *
         * Developers should subscribe to the {@link Ext.data.Store#event-update} event to have their code notified of commit
         * operations.
         *
         * @param {Boolean} [silent=false] Pass `true` to skip notification of the owning store of the change.
         * @param {String[]} [modifiedFieldNames] Array of field names changed during sync with server if known.
         * Omit or pass `null` if unknown. An empty array means that it is known that no fields were modified
         * by the server's response.
         * Defaults to false.
         */
        commit : function(silent, modifiedFieldNames) {
            var me = this;

            me.phantom = me.dirty = me.editing = false;
            me.modified = {};

            if (silent !== true) {
                me.afterCommit(modifiedFieldNames);
            }
        },

        /**
         * Creates a copy (clone) of this Model instance.
         *
         * @param {String} [id] A new id, defaults to the id of the instance being copied.
         * See `{@link Ext.data.Model#id id}`. To generate a phantom instance with a new id use:
         *
         *     var rec = record.copy(); // clone the record
         *     Ext.data.Model.id(rec); // automatically generate a unique sequential id
         *
         * @return {Ext.data.Model}
         */
        copy : function(newId) {
            var me = this;
            return new me.self(me.raw, newId, null, Ext.apply({}, me[me.persistenceProperty]));
        },

        /**
         * Sets the Proxy to use for this model. Accepts any options that can be accepted by
         * {@link Ext#createByAlias Ext.createByAlias}.
         *
         * @param {String/Object/Ext.data.proxy.Proxy} proxy The proxy
         * @return {Ext.data.proxy.Proxy}
         */
        setProxy: function(proxy) {
            //make sure we have an Ext.data.proxy.Proxy object
            if (!proxy.isProxy) {
                if (typeof proxy === "string") {
                    proxy = {
                        type: proxy
                    };
                }
                proxy = Ext.createByAlias("proxy." + proxy.type, proxy);
            }
            proxy.setModel(this.self);
            this.proxy = proxy;

            return proxy;
        },

        /**
         * Returns the configured Proxy for this Model.
         * @return {Ext.data.proxy.Proxy} The proxy
         */
        getProxy: function() {
            return this.hasOwnProperty('proxy') ? this.proxy : this.self.getProxy();
        },

        /**
         * Validates the current data against all of its configured {@link #validations}.
         * @return {Ext.data.Errors} The errors object
         */
        validate: function() {
            var errors      = new Ext.data.Errors(),
                validations = this.validations,
                validators  = Ext.data.validations,
                length, validation, field, valid, type, i;

            if (validations) {
                length = validations.length;

                for (i = 0; i < length; i++) {
                    validation = validations[i];
                    field = validation.field || validation.name;
                    type  = validation.type;
                    valid = validators[type](validation, this.get(field));

                    if (!valid) {
                        errors.add({
                            field  : field,
                            message: validation.message || validators[type + 'Message']
                        });
                    }
                }
            }

            return errors;
        },

        /**
         * Checks if the model is valid. See {@link #validate}.
         * @return {Boolean} True if the model is valid.
         */
        isValid: function(){
            return this.validate().isValid();
        },

        /**
         * Saves the model instance using the configured proxy.
         * @param {Object} [options] Options to pass to the proxy. Config object for {@link Ext.data.Operation}.
         * @return {Ext.data.Model} The Model instance
         */
        save: function(options) {
            options = Ext.apply({}, options);

            var me     = this,
                action = me.phantom ? 'create' : 'update',
                scope  = options.scope || me,
                stores = me.stores,
                i = 0,
                storeCount,
                store,
                operation,
                callback;

            Ext.apply(options, {
                records: [me],
                action : action
            });

            operation = new Ext.data.Operation(options);

            callback = function(operation) {
                var success = operation.wasSuccessful();

                if (success) {
                    for(storeCount = stores.length; i < storeCount; i++) {
                        store = stores[i];
                        store.fireEvent('write', store, operation);
                        store.fireEvent('datachanged', store);
                        // Not firing refresh here, since it's a single record
                    }
                    Ext.callback(options.success, scope, [me, operation]);
                }
                else {
                    Ext.callback(options.failure, scope, [me, operation]);
                }

                Ext.callback(options.callback, scope, [me, operation, success]);
            };

            me.getProxy()[action](operation, callback, me);

            return me;
        },

        /**
         * Destroys the model using the configured proxy.
         * @param {Object} options Options to pass to the proxy. Config object for {@link Ext.data.Operation}.
         * @return {Ext.data.Model} The Model instance
         */
        destroy: function(options) {
            options = Ext.apply({
                records: [this],
                action : 'destroy'
            }, options);

            var me = this,
                isNotPhantom = me.phantom !== true,
                scope  = options.scope || me,
                stores,
                i = 0,
                storeCount,
                store,
                args,
                operation,
                callback;

            operation = new Ext.data.Operation(options);

            callback = function(operation) {
                args = [me, operation];

                // The stores property will be mutated, so clone it first
                stores = Ext.Array.clone(me.stores);
                if (operation.wasSuccessful()) {
                    for (storeCount = stores.length; i < storeCount; i++) {
                        store = stores[i];

                        // If the store has a remove (it's not a TreeStore), then
                        // remove this record from Store. Avoid Store handling anything by passing the "isMove" flag
                        if (store.remove) {
                            store.remove(me, true);
                        }

                        // Other parties may need to know that the record as gone
                        // eg View SelectionModels
                        store.fireEvent('bulkremove', store, [me], [store.indexOf(me)], false);
                        if (isNotPhantom) {
                            store.fireEvent('write', store, operation);
                        }
                    }
                    me.clearListeners();
                    Ext.callback(options.success, scope, args);
                } else {
                    Ext.callback(options.failure, scope, args);
                }
                Ext.callback(options.callback, scope, args);
            };

            // Not a phantom, then we must perform this operation on the remote datasource.
            // Record will be removed from the store in the callback upon a success response
            if (isNotPhantom) {
                me.getProxy().destroy(operation, callback, me);
            }
            // If it's a phantom, then call the callback directly with a dummy successful ResultSet
            else {
                operation.complete = operation.success = true;
                operation.resultSet = me.getProxy().reader.nullResultSet;
                callback(operation);
            }
            return me;
        },

        /**
         * Returns the unique ID allocated to this model instance as defined by {@link #idProperty}.
         * @return {Number/String} The id
         */
        getId: function() {
            return this.get(this.idField.name);
        },

        /**
         * @private
         */
        getObservableId: function() {
            return this.id;
        },

        /**
         * Sets the model instance's id field to the given id.
         * @param {Number/String} id The new id
         */
        setId: function(id) {
            this.set(this.idProperty, id);
        },

        changeId: function(oldId, newId) {
            var me = this,
                hasOldId, hasId, oldInternalId;

            if (!me.preventInternalUpdate) {
                hasOldId = me.hasId(oldId);
                hasId = me.hasId(newId);
                oldInternalId = me.internalId;
                me.phantom  = !hasId;
                // The internal id changes if:
                // a) We had an id before and now we don't
                // b) We didn't have an id before and now we do
                // c) We had an id and we're setting a new id
                if (hasId !== hasOldId || (hasId && hasOldId)) {
                    me.internalId = hasId ? newId : Ext.data.Model.id(me);
                }

                me.fireEvent('idchanged', me, oldId, newId, oldInternalId);
                me.callStore('onIdChanged', oldId, newId, oldInternalId);
             }
        },

        /**
         * @private
         * Checks if this model has an id assigned
         * @param {Object} [id] The id, if not passed it will call getId()
         * @return {Boolean} True if the model has an id
         */
        hasId: function(id) {
            if (arguments.length === 0) {
                id = this.getId();
            }
            return !!(id || id === 0);
        },

        /**
         * Tells this model instance that it has been added to a store.
         * @param {Ext.data.Store} store The store to which this model has been added.
         */
        join : function(store) {
            var me = this;

            // Code for the 99% use case using fast way!
            if (!me.stores.length) {
                me.stores[0] = store;
            } else {
                Ext.Array.include(this.stores, store);
            }

            /**
             * @property {Ext.data.Store} store
             * The {@link Ext.data.Store Store} to which this instance belongs. NOTE: If this
             * instance is bound to multiple stores, this property will reference only the
             * first. To examine all the stores, use the {@link #stores} property instead.
             */
            this.store = this.stores[0]; // compat w/all releases ever
        },

        /**
         * Tells this model instance that it has been removed from the store.
         * @param {Ext.data.Store} store The store from which this model has been removed.
         */
        unjoin: function(store) {
            Ext.Array.remove(this.stores, store);
            this.store = this.stores[0] || null; // compat w/all releases ever
        },

        /**
         * @private
         * If this Model instance has been {@link #join joined} to a {@link Ext.data.Store store}, the store's
         * afterEdit method is called.
         * @param {String[]} [modifiedFieldNames] Array of field names changed during edit.
         */
        afterEdit : function(modifiedFieldNames) {
            this.callStore('afterEdit', modifiedFieldNames);
        },

        /**
         * @private
         * If this Model instance has been {@link #join joined} to a {@link Ext.data.Store store}, the store's
         * afterReject method is called.
         */
        afterReject : function() {
            this.callStore('afterReject');
        },

        /**
         * @private
         * If this Model instance has been {@link #join joined} to a {@link Ext.data.Store store}, the store's
         * afterCommit method is called,
         * @param {String[]} [modifiedFieldNames] Array of field names changed by syncing this field with the server.
         */
        afterCommit: function(modifiedFieldNames) {
            this.callStore('afterCommit', modifiedFieldNames);
        },

        /**
         * @private
         * Helper function used by afterEdit, afterReject and afterCommit. Calls the given method on the
         * {@link Ext.data.Store store} that this instance has {@link #join joined}, if any. The store function
         * will always be called with the model instance as its single argument. If this model is joined to
         * a Ext.data.NodeStore, then this method calls the given method on the NodeStore and the associated Ext.data.TreeStore
         * @param {String} fn The function to call on the store
         */
        callStore: function(fn) {
            var args = Ext.Array.clone(arguments),
                stores = this.stores,
                i = 0,
                len = stores.length,
                store;

            args[0] = this;
            for (; i < len; ++i) {
                store = stores[i];
                if (store && Ext.isFunction(store[fn])) {
                    store[fn].apply(store, args);
                }
            }
        },

        /**
         * Gets all values for each field in this model and returns an object
         * containing the current data.
         * @param {Boolean} includeAssociated True to also include associated data. Defaults to false.
         * @return {Object} An object hash containing all the values in this model
         */
        getData: function(includeAssociated){
            var me     = this,
                fields = me.fields.items,
                fLen   = fields.length,
                data   = {},
                name, f;

            for (f = 0; f < fLen; f++) {
                name = fields[f].name;
                data[name] = me.get(name);
            }

            if (includeAssociated === true) {
                Ext.apply(data, me.getAssociatedData());
            }
            return data;
        },

        /**
         * Gets all of the data from this Models *loaded* associations. It does this recursively - for example if we have a
         * User which hasMany Orders, and each Order hasMany OrderItems, it will return an object like this:
         *
         *     {
         *         orders: [
         *             {
         *                 id: 123,
         *                 status: 'shipped',
         *                 orderItems: [
         *                     ...
         *                 ]
         *             }
         *         ]
         *     }
         *
         * @return {Object} The nested data set for the Model's loaded associations
         */
        getAssociatedData: function(){
            return this.prepareAssociatedData({}, 1);
        },

        /**
         * @private
         * This complex-looking method takes a given Model instance and returns an object containing all data from
         * all of that Model's *loaded* associations. See {@link #getAssociatedData}
         * @param {Object} seenKeys A hash of all the associations we've already seen
         * @param {Number} depth The current depth
         * @return {Object} The nested data set for the Model's loaded associations
         */
        prepareAssociatedData: function(seenKeys, depth) {
            /*
             * In this method we use a breadth first strategy instead of depth
             * first. The reason for doing so is that it prevents messy & difficult
             * issues when figuring out which associations we've already processed
             * & at what depths.
             */
            var me               = this,
                associations     = me.associations.items,
                associationCount = associations.length,
                associationData  = {},
                // We keep 3 lists at the same index instead of using an array of objects.
                // The reasoning behind this is that this method gets called a lot
                // So we want to minimize the amount of objects we create for GC.
                toRead           = [],
                toReadKey        = [],
                toReadIndex      = [],
                associatedStore, associatedRecords, associatedRecord, o, index, result, seenDepth,
                associationId, associatedRecordCount, association, i, j, type, name;

            for (i = 0; i < associationCount; i++) {
                association = associations[i];
                associationId = association.associationId;

                seenDepth = seenKeys[associationId];
                if (seenDepth && seenDepth !== depth) {
                    continue;
                }
                seenKeys[associationId] = depth;

                type = association.type;
                name = association.name;
                if (type == 'hasMany') {
                    //this is the hasMany store filled with the associated data
                    associatedStore = me[association.storeName];

                    //we will use this to contain each associated record's data
                    associationData[name] = [];

                    //if it's loaded, put it into the association data
                    if (associatedStore && associatedStore.getCount() > 0) {
                        associatedRecords = associatedStore.data.items;
                        associatedRecordCount = associatedRecords.length;

                        //now we're finally iterating over the records in the association. Get
                        // all the records so we can process them
                        for (j = 0; j < associatedRecordCount; j++) {
                            associatedRecord = associatedRecords[j];
                            associationData[name][j] = associatedRecord.getData();
                            toRead.push(associatedRecord);
                            toReadKey.push(name);
                            toReadIndex.push(j);
                        }
                    }
                } else if (type == 'belongsTo' || type == 'hasOne') {
                    associatedRecord = me[association.instanceName];
                    // If we have a record, put it onto our list
                    if (associatedRecord !== undefined) {
                        associationData[name] = associatedRecord.getData();
                        toRead.push(associatedRecord);
                        toReadKey.push(name);
                        toReadIndex.push(-1);
                    }
                }
            }

            for (i = 0, associatedRecordCount = toRead.length; i < associatedRecordCount; ++i) {
                associatedRecord = toRead[i];
                o = associationData[toReadKey[i]];
                index = toReadIndex[i];
                result = associatedRecord.prepareAssociatedData(seenKeys, depth + 1);
                if (index === -1) {
                    Ext.apply(o, result);
                } else {
                    Ext.apply(o[index], result);
                }
            }

            return associationData;
        }
    });