/**
* Get available relation ids
* @param $relation_name
* @return mixed
*/
public function getRelationIds($relation_name)
{
/* @var ActiveRecord|static $this */
if (!isset($this->relationsIds[$relation_name])) {
$this->relationsIds[$relation_name] = [];
$relation = $this->getRelation($relation_name);
if ($relation) {
$relationModel = new $relation->modelClass();
$this->relationsIds[$relation_name] = ArrayHelper::map(parent::__get($relation_name), ModelHelper::getPkColumnName($relationModel), ModelHelper::getPkColumnName($relationModel));
}
}
return $this->relationsIds[$relation_name];
}
