/**
* Deletes/sets null the related objects matching $conditions.
* The action which is taken depends on the dependency between source and targets and also on foreign key nullability
*
* @param array $foreignKey array of foreign key properties
* @param \Cake\ORM\Table $target The associated table
* @param array $conditions The conditions that specifies what are the objects to be unlinked
* @param array $options list of options accepted by `Table::delete()`
* @return bool success
*/
protected function _unlink(array $foreignKey, Table $target, array $conditions = [], array $options = [])
{
$mustBeDependent = !$this->_foreignKeyAcceptsNull($target, $foreignKey) || $this->dependent();
if ($mustBeDependent) {
if ($this->_cascadeCallbacks) {
$conditions = new QueryExpression($conditions);
$conditions->traverse(function ($entry) use($target) {
if ($entry instanceof FieldInterface) {
$entry->setField($target->aliasField($entry->getField()));
}
});
$query = $this->find('all')->where($conditions);
$ok = true;
foreach ($query as $assoc) {
$ok = $ok && $target->delete($assoc, $options);
}
return $ok;
}
$target->deleteAll($conditions);
return true;
}
$updateFields = array_fill_keys($foreignKey, null);
$target->updateAll($updateFields, $conditions);
return true;
}
