/**
* Deletes removed elements from a PersistentCollection instance.
*
* This method is intended to be used with the "pushAll" and "addToSet"
* strategies.
*
* @param PersistentCollection $coll
* @param array $options
*/
private function deleteElements(PersistentCollection $coll, array $options)
{
$deleteDiff = $coll->getDeleteDiff();
if (empty($deleteDiff)) {
return;
}
list($propertyPath, $parent) = $this->getPathAndParent($coll);
$query = array('$unset' => array());
foreach ($deleteDiff as $key => $document) {
$query['$unset'][$propertyPath . '.' . $key] = true;
}
$this->executeQuery($parent, $query, $options);
/**
* @todo This is a hack right now because we don't have a proper way to
* remove an element from an array by its key. Unsetting the key results
* in the element being left in the array as null so we have to pull
* null values.
*/
$this->executeQuery($parent, array('$pull' => array($propertyPath => null)), $options);
}
