| public group ( string $collectionName, mixed $keys, array $initial, MongoDB\BSON\Javascript | string $reduce, array $options = [] ) : array | ||
| $collectionName | string | collection name. |
| $keys | mixed | fields to group by. If an array or non-code object is passed, it will be the key used to group results. If instance of [[\MongoDB\BSON\Javascript]] passed, it will be treated as a function that returns the key to group by. |
| $initial | array | Initial value of the aggregation counter object. |
| $reduce | MongoDB\BSON\Javascript | string | function that takes two arguments (the current document and the aggregation to this point) and does the aggregation. Argument will be automatically cast to [[\MongoDB\BSON\Javascript]]. |
| $options | array | optional parameters to the group command. Valid options include: - condition - criteria for including a document in the aggregation. - finalize - function called once per unique key that takes the final output of the reduce function. |
| Résultat | array | the result of the aggregation. |
public function group($collectionName, $keys, $initial, $reduce, $options = [])
{
$this->document = $this->db->getQueryBuilder()->group($collectionName, $keys, $initial, $reduce, $options);
$cursor = $this->execute();
$result = current($cursor->toArray());
return $result['retval'];
}