gorm软删除妙用-充值，软删除恢复，soft delete

	//账户添加一条充值记录
	recharge := Recharge{UserID: uid, Amount: amount}
	if err := tx.Create(&recharge).Error; err != nil {
		tx.Rollback()
		return err
	}

	// 进行软删除
	// db.Delete(&User{}, 10)
	// db.Delete(&user)
	if err := tx.Delete(&recharge).Error; err != nil {
		tx.Rollback()
		return err
	}

	return tx.Commit().Error

// 管理员查询到所有申请
func GetApplyRecharge(limit, offset int) (recharge []Recharge, err error) {
	//获取DB
	db := GetDB()
	if err := db.Unscoped().Preload("User").Where("deleted_at <> ?", "").Limit(limit).Offset(offset).Find(&recharge).Error; err != nil {
		return recharge, err
	}
	return recharge, err
}

	if err := tx.Unscoped().Model(&recharge).Update("deleted_at", nil).Error; err != nil {
		tx.Rollback()
		return err
	}