public function with(...$fields) {
        foreach ($fields as $f) {
            $this->eagerFields[ $f ] = $f;
        }

        return $this;
    }
public function with(...$fields) {
        foreach ($fields as $f) {
            $this->eagerFields[ $f ] = $f;
        }

        return $this;
    }
public function with ( ... $ fields ) { foreach ( $ fields as $ f ) { $ this -> eagerFields [ $ f ] = $ f ; } return $ this ; }
eager loading fields

@param array ...$fields

@return \wulaphp\db\sql\Query
eager loading fields