Rails ResourceModel

resource_model.rb

# Extracted from Matt Yoho's (https://github.com/mattyoho) talk at Scottish Ruby Conference 2012
# Exploiting the Resource Idiom - https://speakerdeck.com/u/mattyoho/p/exploiting-the-resource-idiom
#
module ResourceModel
  
  def self.inherited(inheritor)
    inheritor.class_eval do
      include ActiveModel::Naming
      include ActiveModel::Validations
      include ActiveModel::Translation
    end 
  end

  attr_reader :attributes, :errors
  
  def initialize(attributes = {})
    @attributes = attributes
    @errors     = ActiveModel::Errors.new(self)
  end

  def to_key; nil end
  def to_param; nil end
  def to_partial_path; "" end
  
  def valid?
    errors.empty?
  end
  
  def persisted?; false end
  
  def read_attribute_for_validation(key)
    @attributes[key]
  end

end