perf: completely avoid SELECT * in DeleteProduct, GetCategory, UpdateCategory, and DeleteCategory handlers by using direct database updates and specific select counts

controllers/product_controller.go

@@ -157,7 +157,7 @@ func GetCategory(c *gin.Context) {
 	}
 
 	var category models.Category
-	if err := config.DB.Where("id = ? AND company_id = ?", catID, *user.CompanyID).First(&category).Error; err != nil {
+	if err := config.DB.Select("id, company_id, name, description, created_at").Where("id = ? AND company_id = ?", catID, *user.CompanyID).First(&category).Error; err != nil {
 		c.JSON(http.StatusNotFound, gin.H{"detail": "Kategori tidak ditemukan"})
 		return
 	}
@@ -215,7 +215,7 @@ func UpdateCategory(c *gin.Context) {
 	}
 
 	var category models.Category
-	if err := config.DB.Where("id = ? AND company_id = ?", catID, *user.CompanyID).First(&category).Error; err != nil {
+	if err := config.DB.Select("id, company_id, name, description").Where("id = ? AND company_id = ?", catID, *user.CompanyID).First(&category).Error; err != nil {
 		c.JSON(http.StatusNotFound, gin.H{"detail": "Kategori tidak ditemukan"})
 		return
 	}
@@ -250,15 +250,16 @@ func DeleteCategory(c *gin.Context) {
 		return
 	}
 
-	var category models.Category
-	if err := config.DB.Preload("Products").Where("id = ? AND company_id = ?", catID, *user.CompanyID).First(&category).Error; err != nil {
-		c.JSON(http.StatusNotFound, gin.H{"detail": "Kategori tidak ditemukan"})
+	var productCount int64
+	config.DB.Model(&models.Product{}).Where("category_id = ?", catID).Count(&productCount)
+	if productCount > 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"detail": fmt.Sprintf("Kategori masih memiliki %d produk. Pindahkan produk dulu.", productCount)})
 		return
 	}
 
-	// Cek apakah masih ada produk aktif/tidak aktif terikat ke kategori ini
-	if len(category.Products) > 0 {
-		c.JSON(http.StatusBadRequest, gin.H{"detail": fmt.Sprintf("Kategori masih memiliki %d produk. Pindahkan produk dulu.", len(category.Products))})
+	var category models.Category
+	if err := config.DB.Select("id, name").Where("id = ? AND company_id = ?", catID, *user.CompanyID).First(&category).Error; err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"detail": "Kategori tidak ditemukan"})
 		return
 	}
 
@@ -489,16 +490,15 @@ func DeleteProduct(c *gin.Context) {
 		return
 	}
 
-	var product models.Product
-	if err := config.DB.Where("id = ? AND company_id = ?", productID, *user.CompanyID).First(&product).Error; err != nil {
-		c.JSON(http.StatusNotFound, gin.H{"detail": "Produk tidak ditemukan"})
+	result := config.DB.Model(&models.Product{}).
+		Where("id = ? AND company_id = ?", productID, *user.CompanyID).
+		Update("is_active", false)
+	if result.Error != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"detail": "Gagal menghapus produk"})
 		return
 	}
-
-	// Soft delete (matikan is_active)
-	product.IsActive = false
-	if err := config.DB.Save(&product).Error; err != nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"detail": "Gagal menghapus produk"})
+	if result.RowsAffected == 0 {
+		c.JSON(http.StatusNotFound, gin.H{"detail": "Produk tidak ditemukan"})
 		return
 	}