Add Preloading and sending NameWithParent field with default value being inp.Name

sq

db/category.go

@@ -39,9 +39,6 @@ var (
 )
 
 func (c *Category) BeforeSave(tx *gorm.DB) error {
-	if c.ParentID == c.ID {
-		return ERROR_CATEGORY_SELF_REFERENCING
-	}
 	if c.ParentID != 0 {
 		var parent Category
 		if err := tx.Find(&parent, c.ParentID).Error; err != nil {
@@ -63,3 +60,10 @@ func (c *Category) BeforeSave(tx *gorm.DB) error {
 	}
 	return nil
 }
+
+func (c *Category) AfterCreate(tx *gorm.DB) error {
+	if c.ParentID == c.ID {
+		return ERROR_CATEGORY_SELF_REFERENCING
+	}
+	return nil
+}

handlers/category.go

@@ -1,16 +1,23 @@
 package handlers
 
 import (
+	"fmt"
+
 	"git.qowevisa.me/Qowevisa/fin-check-api/db"
 	"git.qowevisa.me/Qowevisa/fin-check-api/types"
 	"github.com/gin-gonic/gin"
 )
 
 var categoryTransform func(*db.Category) types.DbCategory = func(inp *db.Category) types.DbCategory {
+	nameWithParent := inp.Name
+	if inp.Parent != nil {
+		nameWithParent = fmt.Sprintf("%s -> %s", inp.Parent.Name, inp.Name)
+	}
 	return types.DbCategory{
 		ID:             inp.ID,
 		Name:           inp.Name,
 		ParentID:       inp.ParentID,
+		NameWithParent: nameWithParent,
 	}
 }
 
@@ -50,7 +57,7 @@ func CategoryGetAll(c *gin.Context) {
 	}
 	dbc := db.Connect()
 	var entities []*db.Category
-	if err := dbc.Find(&entities, db.Category{UserID: userID}).Error; err != nil {
+	if err := dbc.Preload("Parent").Find(&entities, db.Category{UserID: userID}).Error; err != nil {
 		c.JSON(500, types.ErrorResponse{Message: err.Error()})
 		return
 	}

types/types.go

@@ -42,6 +42,8 @@ type DbCategory struct {
 	// Parent is used as a infinite sub-category structure
 	//  Can be 0
 	ParentID uint `json:"parent_id" example:"0"`
+	// Purely UI things
+	NameWithParent string `json:"name_with_parent" example:"World -> Moldova"`
 }
 
 type DbDebt struct {