def express!(emotion, emotive)
      emotion = _emotions_about(emotive).where(emotion: emotion).first_or_initialize

      begin
        emotion.tap(&:save!)
      rescue ActiveRecord::RecordInvalid => e
        raise InvalidEmotion.new(e.record)
      end
    end
def express!(emotion, emotive)
      emotion = _emotions_about(emotive).where(emotion: emotion).first_or_initialize

      begin
        emotion.tap(&:save!)
      rescue ActiveRecord::RecordInvalid => e
        raise InvalidEmotion.new(e.record)
      end
    end
Express an emotion towards another record

 @example
   user = User.first
   picture = Picture.first
   user.express! :happy, picture