Dash
A Trash is a 'translated' Dash where the keys can be remapped from a source hash.
Trashes are useful when you need to read data from another application, such as a Java api, where the keys are named differently from how we would in Ruby.
Defines a property on the Trash. Options are as follows:
:default - Specify a default value for this property, to be
returned before a value is set on the property in a new Dash.
:from - Specify the original key name that will be write only.
:with - Specify a lambda to be used to convert value.
:transform_with - Specify a lambda to be used to convert value
without using the :from option. It transform the property itself.
# File lib/hashie/trash.rb, line 20 def self.property(property_name, options = {}) super if options[:from] if property_name.to_sym == options[:from].to_sym raise ArgumentError, "Property name (#{property_name}) and :from option must not be the same" end translations << options[:from].to_sym if options[:with].respond_to? :call class_eval do define_method "#{options[:from]}=" do |val| self[property_name.to_sym] = options[:with].call(val) end end else class_eval def #{options[:from]}=(val) self[:#{property_name}] = val end end elsif options[:transform_with].respond_to? :call transforms[property_name.to_sym] = options[:transform_with] end end
Set a value on the Dash in a Hash-like way. Only works on pre-existing properties.
# File lib/hashie/trash.rb, line 48 def []=(property, value) if self.class.translations.include? property.to_sym send("#{property}=", value) elsif self.class.transforms.key? property.to_sym super property, self.class.transforms[property.to_sym].call(value) elsif property_exists? property super end end
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