frontend\controllers\StoreController::actionLoadGoods PHP Method

    public function actionLoadGoods($id, $category = 'all', $q = '')
    {
        $offset = (int) Yii::$app->request->post('offset');
        Yii::$app->response->format = Response::FORMAT_JSON;
        /* @var $model Store */
        $model = Store::findOne(['id' => $id, 'status' => [Store::STATUS_ACTIVE, Store::STATUS_REST]]);
        if (!$model) {
            throw new NotFoundHttpException('未找到该营业点！');
        }
        if ($q !== '') {
            $query = $model->getGoods()->andWhere(['or', ['like', 'name', $q], ['like', 'description', $q]]);
        } else {
            $modelCate = $category === 'all' ? null : Category::findOne(['slug' => $category]);
            if ($modelCate) {
                $query = $model->getGoods($modelCate->id);
            } else {
                $query = $model->getGoods();
            }
        }
        $limit = 8;
        $goodsList = $query->offset($offset)->limit($limit)->all();
        $output = ['status' => 'ok', 'html' => '', 'length' => count($goodsList)];
        $output['end'] = $output['length'] < $limit;
        foreach ($goodsList as $goods) {
            $output['html'] .= $this->renderPartial('_item', ['goods' => $goods, 'lazy' => false]);
        }
        return $output;
    }