修改赠品后台修改处理

app/Admin/Forms/SkuGift.php

@@ -42,12 +42,17 @@ class SkuGift extends Form implements LazyRenderable
                 $delGiftIds[] = $gift['id'];
             } else {
                 if (is_null($gift['id'])) {
+                    $gift['remaining'] = $gift['limit'];//剩余数量；
                     $giftSku[] = new ProductGift($gift);
                 } else {
                     $_gift = ProductGift::find($gift['id']);
                     $_gift->gift_sku_id = $gift['gift_sku_id'];
                     $_gift->num = $gift['num'];
                     $_gift->limit = $gift['limit'];
+                    $_gift->remaining = $gift['limit'] > 0 ? ($gift['limit'] - $_gift->sent) : $gift['limit'];
+                    if ($_gift->remaining < 0) {
+                        return $this->response()->error('无法设置限制数量小于已发数量');
+                    }
                     $giftSku[] = $_gift;
                 }
             }
@@ -55,7 +60,7 @@ class SkuGift extends Form implements LazyRenderable
         $skuId = $input['sku_id'];
         $sku = ProductSku::findOrFail($skuId);
         if ($sku->verify_state == 1 || !is_null($sku->release_at)) {//如果是审核中，或者上架中，则无法修改。
-            return $this->response()->error('当前商品目前无法修改赠品')->refresh();
+            return $this->response()->error('当前商品目前无法修改赠品');
         }
         try {
             DB::beginTransaction();

app/Models/ProductGift.php

@@ -12,6 +12,7 @@ class ProductGift extends Model
     protected $fillable = [
         'sku_id',
         'gift_sku_id',
+        'limit',
         'num',
         'sent',
         'remaining',