购物车加入错误

@@ -4,6 +4,7 @@
 namespace app\api\controller;
 
 
+use app\admin\model\litestore\Litestoregoodsspec;
 use app\api\model\GoodsSpec;
 use app\api\model\SpecValue;
 use app\common\controller\Api;
@@ -41,26 +42,29 @@ class Cart extends Api
             'goods_id'    => $goods_id,
             'sku_id'      => $sku_id,
             'user_id'     => $this->auth->id,
-        ];
-
-        $data  = [
-            'user_id'     => $this->auth->id,
             'category_id' => $category_id,
-            'sku_id'      => $sku_id,
-            'goods_id'    => $goods_id,
         ];
+
         $model = new \app\api\model\Cart();
+        $cart  = $model->where($where)->find();
         if ($number == 0) {
-            $id = $model->where($where)->find();
-            if (empty($id)) {
+            if (empty($cart)) {
                 $this->error('购物车不存在');
             }
-            $model->where('id', $id['id'])->delete();
+            $model->where('id', $cart['id'])->delete();
         }
-        $cart = $model->where($data)->find();
+        $spec_sku = new Litestoregoodsspec();
         if ($cart) {
+            $spec_sku->where('goods_spec_id', $sku_id)->find();
+            if ($spec_sku['stock_num'] + $cart['number'] < $number) {
+                $this->error('库存不足');
+            }
             $cart->setInc('number', $number);
         } else {
+            $spec_sku->where('goods_spec_id', $sku_id)->find();
+            if ($spec_sku['stock_num'] < $number) {
+                $this->error('库存不足');
+            }
             $data['number'] = $number;
             $model->isUpdate(false)->save($data);
         }
@@ -106,17 +110,9 @@ class Cart extends Api
     {
         $id     = $this->request->post('id');
         $number = $this->request->post('number');
-//        $sku_id   = $this->request->post('sku_id');
-//        $goods_id = $this->request->post('goods_id');
-//        $number   = $this->request->post('number');
         if (!is_numeric($id) || !is_numeric($number)) $this->error('参数不合法');
-//        $where = [
-//            'goods_id' => $goods_id,
-//            'sku_id'   => $sku_id,
-//            'user_id'  => $this->auth->id,
-//        ];
+
         $model = new \app\api\model\Cart();
-//        $id    = $model->where($where)->value('id');
         $order = $model->with('sku')->where('id', $id)->find();
         if ($number + $order['number'] > $order['sku']['stock_num']) $this->error('已达到最大库存，请勿重复提交');
         $model->where('id', $id)->setInc('number', $number);