fix: duplicate entry in insert transaction

models/folder.go

@@ -23,15 +23,13 @@ type Folder struct {
 
 // Create 创建目录
 func (folder *Folder) Create() (uint, error) {
-	tx := DB.Begin()
-	if err := tx.FirstOrCreate(folder, *folder).Error; err != nil {
-		tx.Rollback()
-		util.Log().Warning("无法插入目录记录, %s", err)
-		return 0, err
+	if err := DB.FirstOrCreate(folder, *folder).Error; err != nil {
+		folder.Model = gorm.Model{}
+		err2 := DB.First(folder, *folder).Error
+		return folder.ID, err2
 	}
 
-	err := tx.Commit().Error
-	return folder.ID, err
+	return folder.ID, nil
 }
 
 // GetChild 返回folder下名为name的子目录，不存在则返回错误