Rails utility class for objets to act like ActiveRecord::Base

base.rb

# encoding: utf-8
# Base class to inherit from for objects to act like ActiveRecord::Base
# without using a database. Lets you use validations, errors, forms, routes.
#
# Example:
#   class Exporter < Base
#     attributes_accessor :email, :data
#   end
class Base
  extend ActiveModel::Naming
  include ActiveModel::Serialization
  include ActiveModel::Validations

  # Stores all attributes in a hash
  attr_accessor :attributes

  def initialize(attributes = {})
    @attributes = attributes
  end
  def to_model()    self  end
  def to_key()      false end
  def new_record?() true  end
  def persisted?()  false end

  # Create readers and writers that store the data in @attributes
  # Example:
  #   attributes_reader :bar
  #   attributes_writer :foo
  #   attributes_accessor :spam, :wham
  def self.attributes_accessor(*syms)
    attributes_reader(*syms)
    attributes_writer(*syms)
  end

  def self.attributes_reader(*syms)
    syms.each do |sym|
      class_eval(<<-EOS, __FILE__, __LINE__ + 1)
        def #{sym}
          @attributes[:#{sym}]
        end

        def #{sym}?
          not @attributes[:#{sym}].blank? and @attributes[:#{sym}] != "0"
        end
      EOS
    end
  end

  def self.attributes_writer(*syms)
    syms.each do |sym|
      class_eval(<<-EOS, __FILE__, __LINE__ + 1)
        def #{sym}=(obj)
          @attributes[:#{sym}] = obj
        end
      EOS
    end
  end
end