Doctrine\ODM\MongoDB\Aggregation\Builder::lookup PHP Method

public lookup ( string $from ) : Lookup
$from	string
return	Doctrine\ODM\MongoDB\Aggregation\Stage\Lookup

    public function lookup($from)
    {
        return $this->addStage(new Stage\Lookup($this, $from, $this->dm, $this->class));
    }

Builder