Attribute Serializer, serializeable, with fix for default values.

attribute_serializer.rb

module AttributeSerializer
  module ActiveRecordExtensions
    module ClassMethods

      def serializeable(serialized, serialized_accessors={})
        serialize serialized, serialized_accessors.class

        serialized_attr_accessor serialized, serialized_accessors
        default_serialized_attr serialized, serialized_accessors
      end

      # Creates the accessors
      def serialized_attr_accessor(serialized, accessors)
        accessors.each_pair do |k,v|
          define_method("#{k}") do
            if self[serialized] && !self[serialized][k].nil?
              self[serialized][k]
            else
              v
            end
          end

          define_method("#{k}=") do |value|
            self[serialized][k] = value
          end
        end
      end

      # Sets the default value of the serialized field
      def default_serialized_attr(serialized, accessors)
        method_name =  "set_default_#{serialized}"
        after_initialize method_name

        define_method(method_name) do
          self[serialized] = accessors if self[serialized].nil?
        end
      end

    end
  end
end

class ActiveRecord::Base
  extend AttributeSerializer::ActiveRecordExtensions::ClassMethods
end