NilPortugues\Sql\QueryBuilder\Manipulation\JoinQuery::joinCondition PHP Метод

    public function joinCondition()
    {
        if (!isset($this->joinCondition)) {
            $this->joinCondition = QueryFactory::createWhere($this->select);
        }
        return $this->joinCondition;
    }

 /**
  * Alias to joinCondition
  * @return Where
  */
 public function on()
 {
     return $this->joinQuery->joinCondition();
 }