More efficient?

moarbetter.rb

      # 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 = []
            a << self.all.select { |s| 
              s[serialized][k] == val 
            }
            a unless a.empty?
          end
        end
      end