Returns the current constraints
# File lib/active_scaffold/constraints.rb, line 7 def active_scaffold_constraints @active_scaffold_constraints ||= active_scaffold_session_storage[:constraints] || {} end
Applies constraints to the given record.
Searches through the known columns for association columns. If the given constraint is an association, it assumes that the constraint value is an id. It then does a association.klass.find with the value and adds the associated object to the record.
For some operations ActiveRecord will automatically update the database. That’s not always ok. If it is ok (e.g. you’re in a transaction), then set :allow_autosave to true.
# File lib/active_scaffold/constraints.rb, line 141 def apply_constraints_to_record(record, options = {}) options[:allow_autosave] = false if options[:allow_autosave].nil? active_scaffold_constraints.each do |k, v| column = active_scaffold_config.columns[k] if column and column.association if column.plural_association? record.send("#{k}").send(:<<, column.association.klass.find(v)) elsif column.association.options[:polymorphic] raise ActiveScaffold::MalformedConstraint, polymorphic_constraint_error(column.association), caller unless params[:parent_model] record.send("#{k}=", params[:parent_model].constantize.find(v)) else # regular singular association record.send("#{k}=", column.association.klass.find(v)) # setting the belongs_to side of a has_one isn't safe. if the has_one was already # specified, rails won't automatically clear out the previous associated record. # # note that we can't take the extra step to correct this unless we're permitted to # run operations where activerecord auto-saves the object. reverse = column.association.klass.reflect_on_association(column.association.reverse) if reverse.macro == :has_one and options[:allow_autosave] record.send(k).send("#{column.association.reverse}=", record) end end else record.send("#{k}=", v) end end end
We do NOT want to use .search_sql. If anything, search_sql will refer to a human-searchable value on the associated record.
# File lib/active_scaffold/constraints.rb, line 87 def condition_from_association_constraint(association, value) # when the reverse association is a :belongs_to, the id for the associated object only exists as # the primary_key on the other table. so for :has_one and :has_many (when the reverse is :belongs_to), # we have to use the other model's primary_key. # # please see the relevant tests for concrete examples. field = if [:has_one, :has_many].include?(association.macro) association.klass.primary_key elsif [:has_and_belongs_to_many].include?(association.macro) association.association_foreign_key else association.options[:foreign_key] || association.name.to_s.foreign_key end table = case association.macro when :has_and_belongs_to_many association.options[:join_table] when :belongs_to active_scaffold_config.model.table_name else association.table_name end if association.options[:primary_key] value = association.klass.find(value).send(association.options[:primary_key]) end condition = {"#{table}.#{field}" => value} if association.options[:polymorphic] raise ActiveScaffold::MalformedConstraint, polymorphic_constraint_error(association), caller unless params[:parent_model] condition["#{table}.#{association.name}_type"] = params[:parent_model].constantize.model.to_s end condition end
Returns search conditions based on the current scaffold constraints.
Supports constraints based on either a column name (in which case it checks for an association or just uses the search_sql) or a database field name.
All of this work is primarily to support nested scaffolds in a manner generally useful for other embedded scaffolds.
# File lib/active_scaffold/constraints.rb, line 43 def conditions_from_constraints hash_conditions = {} conditions = [hash_conditions] active_scaffold_constraints.each do |k, v| column = active_scaffold_config.columns[k] if column # Assume this is a multi-level association constraint. # example: # data model: Park -> Den -> Bear # constraint: :den => {:park => 5} if v.is_a? Hash far_association = column.association.klass.reflect_on_association(v.keys.first) field = far_association.klass.primary_key table = far_association.table_name active_scaffold_includes.concat([{k => far_association.name}]) # e.g. {:den => :park} hash_conditions.merge!("#{table}.#{field}" => v.values.first) # association column constraint elsif column.association if column.association.macro == :has_and_belongs_to_many active_scaffold_habtm_joins.concat column.includes else active_scaffold_includes.concat column.includes end hash_conditions.merge!(condition_from_association_constraint(column.association, v)) # regular column constraints elsif column.searchable? && params[column.name] != v active_scaffold_includes.concat column.includes conditions << [column.search_sql.collect { |search_sql| "#{search_sql} = ?" }.join(' OR '), *([v] * column.search_sql.size)] end # unknown-to-activescaffold-but-real-database-column constraint elsif active_scaffold_config.model.columns_hash[k.to_s] && params[column.name] != v hash_conditions.merge!(k => v) else raise ActiveScaffold::MalformedConstraint, constraint_error(active_scaffold_config.model, k), caller end end conditions end
# File lib/active_scaffold/constraints.rb, line 129 def constraint_error(klass, column_name) "Malformed constraint `#{klass}##{column_name}'. If it's a legitimate column, and you are using a nested scaffold, please specify or double-check the reverse association name." end
# File lib/active_scaffold/constraints.rb, line 125 def polymorphic_constraint_error(association) "Malformed constraint. You have added a constraint for #{association.name} polymorphic association but parent_model is not set." end
For each enabled action, adds the constrained columns to the ActionColumns object (if it exists). This lets the ActionColumns object skip constrained columns.
If the constraint value is a Hash, then we assume the constraint is a multi-level association constraint (the reverse of a has_many :through) and we do NOT register the constraint column.
# File lib/active_scaffold/constraints.rb, line 15 def register_constraints_with_action_columns(constrained_fields = nil) constrained_fields ||= [] constrained_fields |= active_scaffold_constraints.reject{|k, v| v.is_a? Hash}.keys.collect(&:to_sym) exclude_actions = [] [:list, :update].each do |action_name| if active_scaffold_config.actions.include? action_name exclude_actions << action_name unless active_scaffold_config.send(action_name).hide_nested_column end end if self.class.uses_active_scaffold? # we actually want to do this whether constrained_fields exist or not, so that we can reset the array when they don't active_scaffold_config.actions.each do |action_name| next if exclude_actions.include?(action_name) action = active_scaffold_config.send(action_name) next unless action.respond_to? :columns action.columns.constraint_columns = constrained_fields end end end