compute recursive path

internal/photos/api/album.go

@@ -1,13 +1,11 @@
 package api
 
 import (
-	"errors"
 	"net/http"
 
 	"github.com/gin-gonic/gin"
 	"gitlab.celogeek.com/photos/api/internal/photos/models"
 	"gopkg.in/validator.v2"
-	"gorm.io/gorm"
 	"gorm.io/gorm/clause"
 )
 
@@ -28,27 +26,20 @@ func (s *Service) AlbumCreate(c *gin.Context) {
 
 	sess := s.CurrentSession(c)
 
-	var parentAlbum *models.Album
-
 	if req.Parent != nil {
-		parentAlbum = &models.Album{}
-		if err := s.
-			DB.
-			Debug().
-			Preload("Author").
-			Find(parentAlbum, req.Parent).Error; err != nil {
-			if errors.Is(err, gorm.ErrRecordNotFound) {
-				s.Error(c, http.StatusNotFound, ErrAlbumDontExists)
-			} else {
-				s.Error(c, http.StatusInternalServerError, err)
-			}
+		var parentExists int64
+		if err := s.DB.Model(&models.Album{}).Where("id = ?", req.Parent).Count(&parentExists).Error; err != nil {
+			s.Error(c, http.StatusInternalServerError, err)
+			return
+		}
+		if parentExists == 0 {
+			s.Error(c, http.StatusNotFound, ErrAlbumDontExists)
 			return
 		}
 	}
 
 	album := &models.Album{
 		Name:     req.Name,
-		Parent:   parentAlbum,
 		ParentId: req.Parent,
 		Author:   sess.Account,
 		AuthorId: &sess.Account.ID,

internal/photos/models/album.go

@@ -1,6 +1,7 @@
 package models
 
 import (
+	"path/filepath"
 	"time"
 
 	"gorm.io/gorm"
@@ -9,8 +10,9 @@ import (
 type Album struct {
 	ID        uint32    `gorm:"primary_key" json:"id"`
 	Name      string    `gorm:"not null" json:"name"`
-	Parent    *Album    `gorm:"constraint:OnDelete:SET NULL,OnUpdate:CASCADE" json:"parent"`
-	ParentId  *uint32   `json:"-"`
+	Fullname  string    `gorm:"-" json:"fullname"`
+	Parent    *Album    `gorm:"constraint:OnDelete:SET NULL,OnUpdate:CASCADE" json:"-"`
+	ParentId  *uint32   `json:"parent_id"`
 	Author    *Account  `gorm:"constraint:OnDelete:SET NULL,OnUpdate:CASCADE" json:"author"`
 	AuthorId  *uint32   `json:"-"`
 	Photos    []*Photo  `gorm:"many2many:album_photos" json:"-"`
@@ -19,9 +21,24 @@ type Album struct {
 }
 
 func (a *Album) AfterFind(tx *gorm.DB) error {
-	if a.ParentId != nil {
-		a.Parent = &Album{}
-		return tx.Preload("Author").First(a.Parent, a.ParentId).Error
+	a.ComputeFullpath(tx)
+	return nil
+}
+
+func (a *Album) AfterCreate(tx *gorm.DB) error {
+	a.ComputeFullpath(tx)
+	return nil
+}
+
+func (a *Album) ComputeFullpath(tx *gorm.DB) error {
+	if a.ParentId == nil {
+		a.Fullname = a.Name
+	} else {
+		parent := &Album{}
+		if err := tx.Session(&gorm.Session{NewDB: true}).Select("name", "parent_id").First(parent, "id = ?", a.ParentId).Error; err != nil {
+			return err
+		}
+		a.Fullname = filepath.Join(parent.Fullname, a.Name)
 	}
 	return nil
 }