被收藏数不能小于0

src/main/java/com/miekir/shibei/controller/api/FavController.java

@@ -78,6 +78,9 @@ public class FavController {
                 goodsBean.favNum = 0L;
             }
             goodsBean.favNum = goodsBean.favNum-1;
+            if (goodsBean.favNum < 0) {
+                goodsBean.favNum = 0L;
+            }
         }
 
         goodsRepository.save(goodsBean);