yii\mongodb\Collection::mapReduce PHP Méthode

mapReduce() public méthode

Note: this function will not return the aggregation result, instead it will write it inside the another Mongo collection specified by "out" parameter. For example: php $customerCollection = Yii::$app->mongo->getCollection('customer'); $resultCollectionName = $customerCollection->mapReduce( 'function () {emit(this.status, this.amount)}', 'function (key, values) {return Array.sum(values)}', 'mapReduceOut', ['status' => 3] ); $query = new Query(); $results = $query->from($resultCollectionName)->all();
public mapReduce ( MongoDB\BSON\Javascript | string $map, MongoDB\BSON\Javascript | string $reduce, string | array $out, array $condition = [], array $options = [] ) : string | array
$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 criteria for including a document in the aggregation.
$options array additional optional parameters to the mapReduce command. Valid options include: - sort: array, key to sort the input documents. The sort key must be in an existing index for this collection. - limit: int, the maximum number of documents to return in the collection. - finalize: \MongoDB\BSON\Javascript|string, function, which follows the reduce method and modifies the output. - scope: array, specifies global variables that are accessible in the map, reduce and finalize functions. - jsMode: bool, specifies whether to convert intermediate data into BSON format between the execution of the map and reduce functions. - verbose: bool, specifies whether to include the timing information in the result information.
Résultat string | array the map reduce output collection name or output results.
    public function mapReduce($map, $reduce, $out, $condition = [], $options = [])
    {
        return $this->database->createCommand()->mapReduce($this->name, $map, $reduce, $out, $condition, $options);
    }