sbusso / merb_radiant

a try to move radiant on merb

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merb_radiant / lib / active_record_extensions.rb
100644 18 lines (17 sloc) 0.457 kb
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require 'active_record'
 
class ActiveRecord::Base
  def self.object_id_attr(symbol, klass)
    module_eval %{
      def #{symbol}
        if @#{symbol}.nil? or (@old_#{symbol}_id != #{symbol}_id)
          @old_#{symbol}_id = #{symbol}_id
          klass = #{klass}.descendants.find { |d| d.#{symbol}_name == #{symbol}_id }
          klass ||= #{klass}
          @#{symbol} = klass.new
        else
          @#{symbol}
        end
      end
    }
  end
end