array( self::NOT_PRESENT => 'Attribute {{name}} must be present', self::INVALID => 'Attribute {{name}} must be valid', ), self::MODE_NEGATIVE => array( self::NOT_PRESENT => 'Attribute {{name}} must not be present', self::INVALID => 'Attribute {{name}} must not validate', ) ); public function chooseTemplate() { return $this->getParam('hasReference') ? static::INVALID : static::NOT_PRESENT; } }