/**
* Accessor to children relations.
*
* @param {?AbstractModel|int|string|array} $children If provided, add them as children in relation.
* @param {?string} $collection Collection identifier for the relation, defaults to the model's collection name.
*
* @return {array} Existing children before modification.
*/
protected function children($collection = null, $children = null, $replace = false)
{
if ($collection === null) {
$collection = $this->collectionName();
}
$return = Relation::getChildren($this->identity(), $collection);
if ($children) {
if ($replace) {
$this->deleteDescendants($collection);
}
if (!is_array($children)) {
$children = array($children);
}
foreach ($children as $child) {
if ($child instanceof AbstractModel) {
$child = $child->identity();
}
Relation::set($this->identity(), $child, $collection);
}
}
return $return;
}
