diff --git a/handlers/category.go b/handlers/category.go
index 181ba86..620b973 100644
--- a/handlers/category.go
+++ b/handlers/category.go
@@ -1,12 +1,8 @@
 package handlers
 
 import (
-	"fmt"
-	"strconv"
-
 	"git.qowevisa.me/Qowevisa/gonuts/db"
 	"git.qowevisa.me/Qowevisa/gonuts/types"
-	"git.qowevisa.me/Qowevisa/gonuts/utils"
 	"github.com/gin-gonic/gin"
 )
 
@@ -20,54 +16,18 @@ import (
 // @Success 200 {object} types.DbCategory
 // @Failure 400 {object} types.ErrorResponse
 // @Failure 401 {object} types.ErrorResponse
+// @Failure 403 {object} types.ErrorResponse
 // @Failure 500 {object} types.ErrorResponse
 // @Security ApiKeyAuth
 // @Router /category/:id [get]
 func CategoryGetId(c *gin.Context) {
-	userIDAny, exists := c.Get("UserID")
-	if !exists {
-		c.JSON(500, types.ErrorResponse{Message: "Internal error 001"})
-		return
-	}
-
-	var userID uint
-	if userIDVal, ok := userIDAny.(uint); !ok {
-		c.JSON(500, types.ErrorResponse{Message: "Internal error 002"})
-		return
-	} else {
-		userID = userIDVal
-	}
-
-	idStr := c.Param("id")
-	var id uint
-	if idVal, err := strconv.ParseUint(idStr, 10, 32); err != nil {
-		c.JSON(400, types.ErrorResponse{Message: "Invalid request"})
-		return
-	} else {
-		id = uint(idVal)
-	}
-
-	var dbCategory db.Category
-	dbc := db.Connect()
-	if err := dbc.Find(&dbCategory, id).Error; err != nil {
-		c.JSON(500, types.ErrorResponse{Message: err.Error()})
-		return
-	}
-	if dbCategory.ID == 0 {
-		c.JSON(500, types.ErrorResponse{Message: "DAFUQ003"})
-		return
-	}
-	if dbCategory.UserID != userID {
-		c.JSON(401, types.ErrorResponse{Message: "This category.id is not yours, you sneaky."})
-		return
-	}
-
-	category := types.DbCategory{
-		Name:     dbCategory.Name,
-		ParentID: dbCategory.ParentID,
-		UserID:   userID,
-	}
-	c.JSON(200, category)
+	GetHandler(func(inp *db.Category) types.DbCategory {
+		return types.DbCategory{
+			ID:       inp.ID,
+			Name:     inp.Name,
+			ParentID: inp.ParentID,
+		}
+	})(c)
 }
 
 // @Summary Get category by id
@@ -83,44 +43,10 @@ func CategoryGetId(c *gin.Context) {
 // @Security ApiKeyAuth
 // @Router /category/add [post]
 func CategoryAdd(c *gin.Context) {
-	userIDAny, exists := c.Get("UserID")
-	if !exists {
-		c.JSON(500, types.ErrorResponse{Message: "Internal error 001"})
-		return
-	}
-
-	var userID uint
-	if userIDVal, ok := userIDAny.(uint); !ok {
-		c.JSON(500, types.ErrorResponse{Message: "Internal error 002"})
-		return
-	} else {
-		userID = userIDVal
-	}
-
-	var category types.DbCategory
-	if err := c.ShouldBindJSON(&category); err != nil {
-		c.JSON(400, types.ErrorResponse{Message: "Invalid request"})
-		return
-	}
-
-	dbCategory := &db.Category{
-		Name:     category.Name,
-		ParentID: category.ParentID,
-		UserID:   userID,
-	}
-	dbc := db.Connect()
-	if err := dbc.Create(&dbCategory).Error; err != nil {
-		c.JSON(500, types.ErrorResponse{Message: err.Error()})
-		return
-	}
-	if dbCategory.ID == 0 {
-		c.JSON(500, types.ErrorResponse{Message: "DAFUQ004"})
-		return
-	}
-	msg := types.Message{
-		Message: fmt.Sprintf("Category with id %d was successfully created!", dbCategory.ID),
-	}
-	c.JSON(200, msg)
+	CreateHandler(&db.Category{}, func(src types.DbCategory, dst *db.Category) {
+		dst.Name = src.Name
+		dst.ParentID = src.ParentID
+	})(c)
 }
 
 // @Summary Edit category by id
@@ -134,67 +60,24 @@ func CategoryAdd(c *gin.Context) {
 // @Success 200 {object} types.DbCategory
 // @Failure 400 {object} types.ErrorResponse
 // @Failure 401 {object} types.ErrorResponse
+// @Failure 403 {object} types.ErrorResponse
 // @Failure 500 {object} types.ErrorResponse
 // @Security ApiKeyAuth
 // @Router /category/edit/:id [put]
 func CategoryPutId(c *gin.Context) {
-	userIDAny, exists := c.Get("UserID")
-	if !exists {
-		c.JSON(500, types.ErrorResponse{Message: "Internal error 001"})
-		return
-	}
-
-	var userID uint
-	if userIDVal, ok := userIDAny.(uint); !ok {
-		c.JSON(500, types.ErrorResponse{Message: "Internal error 002"})
-		return
-	} else {
-		userID = userIDVal
-	}
-
-	idStr := c.Param("id")
-	var id uint
-	if idVal, err := strconv.ParseUint(idStr, 10, 32); err != nil {
-		c.JSON(400, types.ErrorResponse{Message: "Invalid request"})
-		return
-	} else {
-		id = uint(idVal)
-	}
-
-	var dbCategory db.Category
-	dbc := db.Connect()
-	if err := dbc.Find(&dbCategory, id).Error; err != nil {
-		c.JSON(500, types.ErrorResponse{Message: err.Error()})
-		return
-	}
-	if dbCategory.ID == 0 {
-		c.JSON(500, types.ErrorResponse{Message: "DAFUQ003"})
-		return
-	}
-	if dbCategory.UserID != userID {
-		c.JSON(401, types.ErrorResponse{Message: "This category.id is not yours, you sneaky."})
-		return
-	}
-	var category types.DbCategory
-	if err := c.ShouldBindJSON(&category); err != nil {
-		c.JSON(400, types.ErrorResponse{Message: "Invalid request"})
-		return
-	}
-
-	utils.MergeNonZeroFields(category, dbCategory)
-
-	if err := dbc.Save(dbCategory).Error; err != nil {
-		c.JSON(500, types.ErrorResponse{Message: err.Error()})
-		return
-	}
-
-	ret := types.DbCategory{
-		ID:       dbCategory.ID,
-		Name:     dbCategory.Name,
-		ParentID: dbCategory.ParentID,
-		UserID:   dbCategory.UserID,
-	}
-	c.JSON(200, ret)
+	UpdateHandler(
+		func(src types.DbCategory, dst *db.Category) {
+			dst.Name = src.Name
+			dst.ParentID = src.ParentID
+		},
+		func(inp *db.Category) types.DbCategory {
+			return types.DbCategory{
+				ID:       inp.ID,
+				Name:     inp.Name,
+				ParentID: inp.ParentID,
+			}
+		},
+	)(c)
 }
 
 // @Summary Delete category by id
@@ -207,57 +90,10 @@ func CategoryPutId(c *gin.Context) {
 // @Success 200 {object} types.DbCategory
 // @Failure 400 {object} types.ErrorResponse
 // @Failure 401 {object} types.ErrorResponse
+// @Failure 403 {object} types.ErrorResponse
 // @Failure 500 {object} types.ErrorResponse
 // @Security ApiKeyAuth
 // @Router /category/delete/:id [delete]
 func CategoryDeleteId(c *gin.Context) {
-	userIDAny, exists := c.Get("UserID")
-	if !exists {
-		c.JSON(500, types.ErrorResponse{Message: "Internal error 001"})
-		return
-	}
-
-	var userID uint
-	if userIDVal, ok := userIDAny.(uint); !ok {
-		c.JSON(500, types.ErrorResponse{Message: "Internal error 002"})
-		return
-	} else {
-		userID = userIDVal
-	}
-
-	idStr := c.Param("id")
-	var id uint
-	if idVal, err := strconv.ParseUint(idStr, 10, 32); err != nil {
-		c.JSON(400, types.ErrorResponse{Message: "Invalid request"})
-		return
-	} else {
-		id = uint(idVal)
-	}
-
-	var dbCategory db.Category
-	dbc := db.Connect()
-	if err := dbc.Find(&dbCategory, id).Error; err != nil {
-		c.JSON(500, types.ErrorResponse{Message: err.Error()})
-		return
-	}
-	if dbCategory.ID == 0 {
-		c.JSON(500, types.ErrorResponse{Message: "DAFUQ003"})
-		return
-	}
-	if dbCategory.UserID != userID {
-		c.JSON(401, types.ErrorResponse{Message: "This category.id is not yours, you sneaky."})
-		return
-	}
-	if err := dbc.Delete(dbCategory).Error; err != nil {
-		c.JSON(500, types.ErrorResponse{Message: err.Error()})
-		return
-	}
-
-	ret := types.DbCategory{
-		ID:       dbCategory.ID,
-		Name:     dbCategory.Name,
-		ParentID: dbCategory.ParentID,
-		UserID:   dbCategory.UserID,
-	}
-	c.JSON(200, ret)
+	DeleteHandler[*db.Category]()(c)
 }