module Hashie::Extensions::Dash::PropertyTranslation::ClassMethods

def inherited(klass)

* :default - The class inheriting the translations.

Ensures that any inheriting classes maintain their translations. 
def inherited(klass)
  super
  klass.instance_variable_set(:@transforms, transforms.dup)
  klass.instance_variable_set(:@translations_hash, translations_hash.dup)
end

def inverse_translations 

def inverse_translations
  @inverse_translations ||= {}.tap do |h|
    translations_hash.each do |(property_name, property_translations)|
      property_translations.keys.each do |k|
        h[k] = property_name
      end
    end
  end
end

def permitted_input_keys 

def permitted_input_keys
  @permitted_input_keys ||= properties.map { |property| inverse_translations.fetch property, property }
end

def property(property_name, options = {})

without using the :from option. It transform the property itself.
* :transform_with - Specify a lambda to be used to convert value
* :with - Specify a lambda to be used to convert value.
* :from - Specify the original key name that will be write only.
returned before a value is set on the property in a new Dash.
* :default - Specify a default value for this property, to be

Defines a property on the Trash. Options are as follows: 
def property(property_name, options = {})
  super
  if options[:from]
    if property_name == options[:from]
      fail ArgumentError, "Property name (#{property_name}) and :from option must not be the same"
    end
    translations_hash[options[:from]] ||= {}
    translations_hash[options[:from]][property_name] = options[:with] || options[:transform_with]
    define_method "#{options[:from]}=" do |val|
      self.class.translations_hash[options[:from]].each do |name, with|
        self[name] = with.respond_to?(:call) ? with.call(val) : val
      end
    end
  else
    if options[:transform_with].respond_to? :call
      transforms[property_name] = options[:transform_with]
    end
  end
end

def transformation_exists?(name) 

def transformation_exists?(name)
  transforms.key? name
end

def transformed_property(property_name, value) 

def transformed_property(property_name, value)
  transforms[property_name].call(value)
end

def translation_exists?(name) 

def translation_exists?(name)
  translations_hash.key? name
end

def translations 

def translations
  @translations ||= {}.tap do |h|
    translations_hash.each do |(property_name, property_translations)|
      if property_translations.size > 1
        h[property_name] = property_translations.keys
      else
        h[property_name] = property_translations.keys.first
      end
    end
  end
end