/**
* Load relation data based on created selector.
*
* @return array|null
*/
protected function loadData()
{
if (!$this->parent->isLoaded()) {
//Nothing to load for unloaded parents
return null;
}
$this->loaded = true;
if (static::MULTIPLE) {
return $this->data = $this->createSelector()->fetchData();
}
$data = $this->createSelector()->fetchData();
if (isset($data[0])) {
return $this->data = $data[0];
}
return null;
}
/**
* Loadable when parent is loaded as well.
*
* @return bool
*/
protected function isLoadable()
{
return $this->parent->isLoaded();
}
