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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
        serialized_finder serialized, serialized_accessors
      end
 
      # Creates the accessors
      def serialized_attr_accessor(serialized, accessors)
        accessors.keys.each do |k|
          define_method("#{k}") do
            self[serialized] && self[serialized][k]
          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
      
      # Creates finders
      def serialized_finder(serialized, accessors)
        accessors.keys.each do |k|
          method_name = "find_by_#{k}"
          define_singleton_method(method_name) do |val=nil|
            a = []
            self.all.each do |s|
              a << s if s.options[k] == val
            end
            a unless a.empty?
          end
        end
      end

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