Doctrine\MongoDB\Query\Expr::rename PHP Method

    public function rename($name)
    {
        $this->requiresCurrentField();
        $this->newObj['$rename'][$this->currentField] = $name;
        return $this;
    }

 /**
  * Rename the current field.
  *
  * @see Expr::rename()
  * @see http://docs.mongodb.org/manual/reference/operator/rename/
  * @param string $name
  * @return self
  */
 public function rename($name)
 {
     $this->expr->rename($name);
     return $this;
 }