def configure
      return quick_join if !join_model
      [subject_model, object_model, join_model].compact.each do |model| 
        model.configure
      end  
    end
def configure
      return quick_join if !join_model
      [subject_model, object_model, join_model].compact.each do |model| 
        model.configure
      end  
    end
configure each model in turn