/**
* Returns the assembled aggregation pipeline
*
* For pipelines where the first stage is a $geoNear stage, it will apply
* the document filters and discriminator queries to the query portion of
* the geoNear operation. For all other pipelines, it prepends a $match stage
* containing the required query.
*
* @return array
*/
public function getPipeline()
{
$pipeline = parent::getPipeline();
if ($this->getStage(0) instanceof GeoNear) {
$pipeline[0]['$geoNear']['query'] = $this->applyFilters($pipeline[0]['$geoNear']['query']);
} else {
$matchStage = $this->applyFilters([]);
if ($matchStage !== []) {
array_unshift($pipeline, ['$match' => $matchStage]);
}
}
return $pipeline;
}
/**
* Deconstructs an array field from the input documents to output a document
* for each element. Each output document is the input document with the
* value of the array field replaced by the element.
*
* @see http://docs.mongodb.org/manual/reference/operator/aggregation/unwind/
*
* @param string $fieldName The field to unwind. It is automatically prefixed with the $ sign
* @return Stage\Unwind
*/
public function unwind($fieldName)
{
return $this->builder->unwind($fieldName);
}