public function checkBehavior()
{
/** @var AttachBehavior $behavior */
$behavior = $this->getAttachBehavior();
$class = AttachBehavior::className();
$name = AttachBehavior::NAME;
if (!$behavior) {
throw new InvalidConfigException("Behavior '{$class}' with name '{$name}' does not exists in model");
}
}
/**
* @inheritdoc
*/
public function behaviors()
{
$behaviors = parent::behaviors();
$behaviors[] = ['class' => AttachBehavior::className(), 'models' => ['avatar' => ['class' => UserAvatarFile::className()]]];
return $behaviors;
}