fix: 批量修复功能问题 - 购物车结算/订单库存积分/搜索/抽奖/个人资料等

backend/internal/api/handlers/product.go

@@ -23,6 +23,14 @@ func (h *CategoryHandler) List(c *gin.Context) {
 	utils.DB.Where("parent_id IS NULL").Order("sort_order ASC, id ASC").Find(&categories)
 	for i := range categories {
 		utils.DB.Where("parent_id = ?", categories[i].ID).Order("sort_order ASC, id ASC").Find(&categories[i].Children)
+		var count int64
+		utils.DB.Table("product_categories").Where("category_id = ?", categories[i].ID).Count(&count)
+		categories[i].ProductCount = count
+		for j := range categories[i].Children {
+			var childCount int64
+			utils.DB.Table("product_categories").Where("category_id = ?", categories[i].Children[j].ID).Count(&childCount)
+			categories[i].Children[j].ProductCount = childCount
+		}
 	}
 	c.JSON(http.StatusOK, gin.H{"data": categories})
 }
@@ -121,6 +129,21 @@ func (h *CategoryHandler) Update(c *gin.Context) {
 
 func (h *CategoryHandler) Delete(c *gin.Context) {
 	id, _ := strconv.Atoi(c.Param("id"))
+
+	var childCount int64
+	utils.DB.Model(&models.Category{}).Where("parent_id = ?", id).Count(&childCount)
+	if childCount > 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "该分类下有子分类，无法删除"})
+		return
+	}
+
+	var productCount int64
+	utils.DB.Table("product_categories").Where("category_id = ?", id).Count(&productCount)
+	if productCount > 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "该分类下有商品，无法删除"})
+		return
+	}
+
 	if err := utils.DB.Delete(&models.Category{}, id).Error; err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to delete category"})
 		return