class Hashie::Trash

def self.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 self.property(property_name, options = {})
  super
  options[:from] = options[:from].to_sym if options[:from]
  property_name = property_name.to_sym
  if options[:from]
    if property_name == options[:from]
      fail ArgumentError, "Property name (#{property_name}) and :from option must not be the same"
    end
    translations[options[:from].to_sym] = property_name.to_sym
    define_method "#{options[:from]}=" do |val|
      with = options[:with] || options[:transform_with]
      self[property_name.to_sym] = with.respond_to?(:call) ? with.call(val) : val
    end
  else
    if options[:transform_with].respond_to? :call
      transforms[property_name.to_sym] = options[:transform_with]
    end
  end
end