dektrium\rbac\models\Assignment::init PHP Method

    public function init()
    {
        parent::init();
        $this->manager = Yii::$app->authManager;
        if ($this->user_id === null) {
            throw new InvalidConfigException('user_id must be set');
        }
        $this->items = array_keys($this->manager->getItemsByUser($this->user_id));
    }