yii\mongodb\Command::mapReduce PHP Метод

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mapReduce() публичный Метод

Performs MongoDB "map-reduce" command.

public mapReduce ( string $collectionName, MongoDB\BSON\Javascript \| string $map, MongoDB\BSON\Javascript \| string $reduce, string \| array $out, array $condition = [], array $options = [] ) : string \| array
$collectionName	string	collection name.
$map	MongoDB\BSON\Javascript \| string	function, which emits map data from collection. Argument will be automatically cast to [[\MongoDB\BSON\Javascript]].
$reduce	MongoDB\BSON\Javascript \| string	function that takes two arguments (the map key and the map values) and does the aggregation. Argument will be automatically cast to [[\MongoDB\BSON\Javascript]].
$out	string \| array	output collection name. It could be a string for simple output ('outputCollection'), or an array for parametrized output (['merge' => 'outputCollection']). You can pass ['inline' => true] to fetch the result at once without temporary collection usage.
$condition	array	filter condition for including a document in the aggregation.
$options	array	additional optional parameters to the mapReduce command. Valid options include: - sort: array, key to sort the input documents. The sort key must be in an existing index for this collection. - limit: int, the maximum number of documents to return in the collection. - finalize: \MongoDB\BSON\Javascript\|string, function, which follows the reduce method and modifies the output. - scope: array, specifies global variables that are accessible in the map, reduce and finalize functions. - jsMode: bool, specifies whether to convert intermediate data into BSON format between the execution of the map and reduce functions. - verbose: bool, specifies whether to include the timing information in the result information.
Результат	string \| array	the map reduce output collection name or output results.

    public function mapReduce($collectionName, $map, $reduce, $out, $condition = [], $options = [])
    {
        $this->document = $this->db->getQueryBuilder()->mapReduce($collectionName, $map, $reduce, $out, $condition, $options);
        $cursor = $this->execute();
        $result = current($cursor->toArray());
        return array_key_exists('results', $result) ? $result['results'] : $result['result'];
    }

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