lib/controllers/ObjectController.php
public function actionWatch()
    {
        if (empty($_GET['id']) or !($object = $this->params['object'] = Registry::getObject($_GET['id'], false)) or !($typeItem = $this->params['typeItem'] = $object->objectTypeItem)) {
            throw new HttpException(404, "Unknown object.");
        }
        if (!$object->can('read')) {
            throw new HttpException(403, "Unable to access object.");
        }
        Yii::$app->request->object = $object;

        $watching = empty($_GET['stop']);
        if ($object->watch($watching)) {
            Yii::$app->response->task = 'trigger';
            if ($watching) {
                Yii::$app->response->success = 'You are now watching ' . $object->descriptor . '.';
                Yii::$app->response->trigger = [
                    ['startedWatching'],
                ];
            } else {
                Yii::$app->response->success = 'You stopped watching ' . $object->descriptor . '.';
                Yii::$app->response->trigger = [
                    ['stoppedWatching'],
                ];
            }
        } else {
            Yii::$app->response->error = 'Unable update the watching status of this object.';
        }
    }
public function actionWatch()
    {
        if (empty($_GET['id']) or !($object = $this->params['object'] = Registry::getObject($_GET['id'], false)) or !($typeItem = $this->params['typeItem'] = $object->objectTypeItem)) {
            throw new HttpException(404, "Unknown object.");
        }
        if (!$object->can('read')) {
            throw new HttpException(403, "Unable to access object.");
        }
        Yii::$app->request->object = $object;

        $watching = empty($_GET['stop']);
        if ($object->watch($watching)) {
            Yii::$app->response->task = 'trigger';
            if ($watching) {
                Yii::$app->response->success = 'You are now watching ' . $object->descriptor . '.';
                Yii::$app->response->trigger = [
                    ['startedWatching'],
                ];
            } else {
                Yii::$app->response->success = 'You stopped watching ' . $object->descriptor . '.';
                Yii::$app->response->trigger = [
                    ['stoppedWatching'],
                ];
            }
        } else {
            Yii::$app->response->error = 'Unable update the watching status of this object.';
        }
    }
[[@doctodo method_description:actionWatch]].

@throws HttpException [[@doctodo exception_description:HttpException]]