update

src/main/java/com/gogirl/application/product/mall/impl/MallShoppingCartCmdServiceImpl.java

@@ -4,6 +4,7 @@ import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.gogirl.application.product.mall.MallShoppingCartCmdService;
 import com.gogirl.assembler.MallShoppingCartAssembler;
 import com.gogirl.domain.order.mall.MallShoppingCart;
+import com.gogirl.infrastructure.common.exception.RRException;
 import com.gogirl.infrastructure.mapper.order.mall.MallShoppingCartMapper;
 import com.gogirl.shared.product.DecreaseCartCommand;
 import com.gogirl.shared.product.MallShoppingCartCommand;
@@ -70,14 +71,18 @@ public class MallShoppingCartCmdServiceImpl implements MallShoppingCartCmdServic
                         .eq(MallShoppingCart::getProductId, cmd.getProductId()));
 
         if (mallShoppingCart != null) {
-            if (mallShoppingCart.getNum() > 1) {
-                mallShoppingCart.setNum((mallShoppingCart.getNum() - 1));
+            mallShoppingCart.setNum((mallShoppingCart.getNum() - 1));
+            if (mallShoppingCart.getNum() > 0) {
                 mallShoppingCartMapper.updateById(mallShoppingCart);
             }
             //移除购物车项
-            else {
+            else if (mallShoppingCart.getNum() == 0) {
                 mallShoppingCartMapper.deleteById(mallShoppingCart.getId());
             }
+            //invalid
+            else {
+                throw new RRException("invalid num");
+            }
         }
     }
 }

src/main/java/com/gogirl/interfaces/product/mall/MallShoppingCartController.java

@@ -57,10 +57,10 @@ public class MallShoppingCartController {
     }
 
     @ApiOperation("减少购物车项")
-    @GetMapping("/customer/mallCart/decreaseMallShoppingCart/{id}")
-    public JsonResult<Integer> decreaseMallShoppingCart(@ApiParam("产品id")
-                                                        @PathVariable Long id) {
-        mallShoppingCartCmdService.decreaseMallShoppingCart(new DecreaseCartCommand(SessionUtils.getCustomerId(), id));
+    @PostMapping("/customer/mallCart/decreaseMallShoppingCart")
+    public JsonResult<Integer> decreaseMallShoppingCart(@RequestBody DecreaseCartCommand cmd) {
+        cmd.setCurrentCustomerId(SessionUtils.getCustomerId());
+        mallShoppingCartCmdService.decreaseMallShoppingCart(cmd);
         return JsonResult.success();
     }
 

src/main/java/com/gogirl/shared/product/DecreaseCartCommand.java

@@ -16,4 +16,6 @@ public class DecreaseCartCommand implements Serializable {
 
     @ApiModelProperty("产品id")
     private Long productId;
+
+    private Integer num;
 }