class Hashie::Trash

in Ruby.
such as a Java api, where the keys are named differently from how we would
Trashes are useful when you need to read data from another application,
hash.
A Trash is a ‘translated’ Dash where the keys can be remapped from a source

def self.inverse_translations 

def self.inverse_translations
  @inverse_translations ||= Hash[translations.map(&:reverse)]
end

def self.permitted_input_keys 

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

def self.properties 

def self.properties
  @properties ||= []
end

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

def self.transforms 

def self.transforms
  @transforms ||= {}
end

def self.translations 

def self.translations
  @translations ||= {}
end

def []=(property, value)

on pre-existing properties.
Set a value on the Dash in a Hash-like way. Only works 
def []=(property, value)
  if self.class.translations.key? 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

def initialize_attributes(attributes)

Deletes any keys that have a translation 
def initialize_attributes(attributes)
  return unless attributes
  attributes_copy = attributes.dup.delete_if do |k, v|
    if self.class.translations.include?(k.to_sym)
      self[k] = v
      true
    end
  end
  super attributes_copy
end

def property_exists?(property)


Raises an NoMethodError if the property doesn't exist 
def property_exists?(property)
  unless self.class.property?(property.to_sym)
    fail NoMethodError, "The property '#{property}' is not defined for this Trash."
  end
  true
end