Doctrine\MongoDB\Query\Builder::distinct PHP Method

Change the query type to a distinct command.

See also: http://docs.mongodb.org/manual/reference/command/distinct/

public distinct ( string $field )
$field	string

    public function distinct($field)
    {
        $this->query['type'] = Query::TYPE_DISTINCT;
        $this->query['distinct'] = $field;
        return $this;
    }

Doctrine\MongoDB\Query\Builder::distinct PHP Method

distinct() public method