public function actionAdd()

    {

        $model = new Goods();

        $model->setScenario('insert');

        if ($model->load(Yii::$app->request->post())) {

            $model->image = UploadedFile::getInstance($model, 'image');

            if ($model->validate()) {

                $model->cover = Yii::$app->security->generateRandomString() . '.' . $model->image->extension;

                if (floatval($model->price_original) < 0.01) {

                    $model->price_original = null;

                }

                $transaction = Yii::$app->db->beginTransaction();

                try {

                    if (!$model->save(false)) {

                        throw new \Exception('商品添加失败！');

                    }

                    $filename = Yii::getAlias(Yii::$app->params['goods.coverPath']) . DIRECTORY_SEPARATOR . $model->cover;

                    if (!$model->image->saveAs($filename)) {

                        throw new \Exception('封面图片添加失败！');

                    }

                    // 记录商品库存

                    $goodsSurplus = new GoodsSurplus();

                    $goodsSurplus->goods_id = $model->id;

                    $goodsSurplus->surplus_before = ;

                    $goodsSurplus->amount = $model->surplus;

                    $goodsSurplus->surplus_after = $model->surplus;

                    $goodsSurplus->remark = '初始化库存。';

                    if (!$goodsSurplus->save(false)) {

                        throw new \Exception('商品库存记录失败！');

                    }

                    $transaction->commit();

                    Yii::$app->session->setFlash('success', '成功添加商品“'.$model->name.'”。');

                    return $this->refresh();

                } catch (\Exception $e) {

                    $transaction->rollBack();

                    Yii::$app->session->setFlash('danger', $e->getMessage());

                }

            }

        }

        return $this->render('form', [

            'model' => $model

        ]);

    }