protected function validation()
    {
        if (null === $this->validation) {
            $this->validation = new ValidationBuilder($this);
        }

        return $this->validation;
    }
protected function validation()
    {
        if (null === $this->validation) {
            $this->validation = new ValidationBuilder($this);
        }

        return $this->validation;
    }
protected function validation ( ) { if ( null === $ this -> validation ) { $ this -> validation = new ValidationBuilder ( $ this ) ; } return $ this -> validation ; }
Gets the builder for validation rules.

@return ValidationBuilder
Gets the builder for validation rules .