LanguageCode string `gorm:"not null;type:varchar(2)"`
	}
	type Item struct {
		gorm.Model
		Logo     string        `gorm:"not null;type:varchar(50)"`
		Contents []ItemContent `gorm:"foreignKey:ItemID"`
	}

	tx := DB.Session(&gorm.Session{})
	tx.Migrator().DropTable(&ItemContent{}, &Item{})
	tx.AutoMigrate(&ItemContent{}, &Item{})

	item := Item{
		Logo: "logo",
		Contents: []ItemContent{

	tx.AutoMigrate(&ItemParent{}, &ItemChild{})

	item := ItemChild{
		Name: "name",
		ItemParent: ItemParent{
			Logo: "logo",
		},
	}
	if err := tx.Create(&item).Error; err != nil {
		t.Fatalf("failed to create items, got error: %v", err)
	}

	// test replace
	if err := tx.Model(&item).Association("ItemParent").Unscoped().Replace(&ItemParent{
		Logo: "updated logo",

		Item1: &QueryResetItem{
			ID:   "u_1_1",
			Name: "item_1_1",
		},
		Item2: &QueryResetItem{
			ID:   "u_1_2",
			Name: "item_1_2",
		},
	}

	q2 := QueryResetNullValue{
		Item1: &QueryResetItem{
			ID:   "u_2_1",
			Name: "item_2_1",
		},
		Item2: &QueryResetItem{
			ID:   "u_2_2",
			Name: "item_2_2",
		},
	}

	var err error