named_scope.rb

module CouchFoo
  module NamedScope
    def self.included(base)
      base.class_eval do
        extend ClassMethods
        named_scope :scoped, lambda { |scope| scope }
      end
    end
 
    module ClassMethods
      def named_scope(name, options = {}, &block)
        # some code was here
        (class << self; self end).instance_eval do
          define_method name do |*args|
            scopes[name].call(self, *args)
          end
        end
      end
    end
  end
end