private function registerRelation($model, $relation)
{
Store::pushIfNotPresent('relation_' . $relation, ['model' => strtolower(get_class($this)), 'target' => $model]);
$type = $relation == 'belongs_to' ? 'list' : 'checkbox_list';
return ['type' => $type, 'label' => ucfirst($model), 'options' => function () use($model) {
$arr = [];
$items = call_user_func(ucfirst($model) . '::find');
foreach ($items as $item) {
$arr[$item->ID] = $item->title;
}
return $arr;
}];
}
