refactor: Update ParentID field to use sql.NullString for nullable values

internal/database/migrations/20240803003234_index.sql

@@ -0,0 +1,8 @@
+-- +goose Up
+-- +goose StatementBegin
+DROP INDEX IF EXISTS teldrive.idx_files_unique_folder;
+CREATE UNIQUE INDEX idx_files_unique_folder 
+ON teldrive.files 
+USING btree (name, COALESCE(parent_id, '00000000-0000-0000-0000-000000000000'::uuid), user_id)
+WHERE (type = 'folder'::text);
+-- +goose StatementEnd

pkg/mapper/mapper.go

@@ -19,7 +19,7 @@ func ToFileOut(file models.File) *schemas.FileOut {
 		Encrypted: file.Encrypted,
 		Size:      size,
 		Starred:   file.Starred,
-		ParentID:  file.ParentID,
+		ParentID:  file.ParentID.String,
 		UpdatedAt: file.UpdatedAt,
 	}
 }

pkg/models/file.go

@@ -1,6 +1,7 @@
 package models
 
 import (
+	"database/sql"
 	"time"
 
 	"github.com/divyam234/teldrive/pkg/schemas"
@@ -18,7 +19,7 @@ type File struct {
 	Encrypted bool                              `gorm:"default:false"`
 	UserID    int64                             `gorm:"type:bigint;not null"`
 	Status    string                            `gorm:"type:text"`
-	ParentID  string                            `gorm:"type:uuid;index"`
+	ParentID  sql.NullString                    `gorm:"type:uuid;index"`
 	Parts     datatypes.JSONSlice[schemas.Part] `gorm:"type:jsonb"`
 	ChannelID *int64                            `gorm:"type:bigint"`
 	CreatedAt time.Time                         `gorm:"default:timezone('utc'::text, now())"`

pkg/services/auth.go

@@ -94,6 +94,7 @@ func (as *AuthService) LogIn(c *gin.Context, session *schemas.TgSession) (*schem
 			MimeType: "drive/folder",
 			UserID:   session.UserID,
 			Status:   "active",
+			Parts:    nil,
 		}
 		if err := as.db.Clauses(clause.OnConflict{DoNothing: true}).Create(file).Error; err != nil {
 			return err

pkg/services/file.go

@@ -3,6 +3,7 @@ package services
 import (
 	"context"
 	"crypto/rand"
+	"database/sql"
 	"encoding/binary"
 	"errors"
 	"fmt"
@@ -100,9 +101,15 @@ func (fs *FileService) CreateFile(c *gin.Context, userId int64, fileIn *schemas.
 		if err != nil {
 			return nil, &types.AppError{Error: err, Code: http.StatusNotFound}
 		}
-		fileDB.ParentID = parent.Id
+		fileDB.ParentID = sql.NullString{
+			String: parent.Id,
+			Valid:  true,
+		}
 	} else if fileIn.ParentID != "" {
-		fileDB.ParentID = fileIn.ParentID
+		fileDB.ParentID = sql.NullString{
+			String: fileIn.ParentID,
+			Valid:  true,
+		}
 
 	} else {
 		return nil, &types.AppError{Error: fmt.Errorf("parent id or path is required"), Code: http.StatusBadRequest}
@@ -110,6 +117,7 @@ func (fs *FileService) CreateFile(c *gin.Context, userId int64, fileIn *schemas.
 
 	if fileIn.Type == "folder" {
 		fileDB.MimeType = "drive/folder"
+		fileDB.Parts = nil
 	} else if fileIn.Type == "file" {
 		channelId := fileIn.ChannelID
 		if fileIn.ChannelID == 0 {
@@ -151,8 +159,11 @@ func (fs *FileService) UpdateFile(id string, userId int64, update *schemas.FileU
 	)
 
 	updateDb := models.File{
-		Name:      update.Name,
-		ParentID:  update.ParentID,
+		Name: update.Name,
+		ParentID: sql.NullString{
+			String: update.ParentID,
+			Valid:  true,
+		},
 		UpdatedAt: update.UpdatedAt,
 		Size:      update.Size,
 		CreatedAt: update.CreatedAt,
@@ -576,7 +587,10 @@ func (fs *FileService) CopyFile(c *gin.Context) (*schemas.FileOut, *types.AppErr
 	dbFile.UserID = userId
 	dbFile.Starred = false
 	dbFile.Status = "active"
-	dbFile.ParentID = dest.Id
+	dbFile.ParentID = sql.NullString{
+		String: dest.Id,
+		Valid:  true,
+	}
 	dbFile.ChannelID = &channelId
 	dbFile.Encrypted = file.Encrypted
 	dbFile.Category = file.Category

pkg/services/file_test.go

@@ -31,7 +31,6 @@ func (s *FileServiceSuite) SetupTest() {
 		MimeType: "drive/folder",
 		UserID:   123456,
 		Status:   "active",
-		ParentID: "root",
 	})
 }