{Value: "en", LanguageCode: "en"},
	}}
	if err := DB.Save(&want).Error; err != nil {
		t.Error(err)
	}

	want2 := Level2{Value: "Tom", LanguageCode: "zh", Level1s: []Level1{
		{Value: "zh", LanguageCode: "zh"},
		{Value: "de", LanguageCode: "de"},
	}}
	if err := DB.Save(&want2).Error; err != nil {
		t.Error(err)
	}

	var got Level2

	}

	blog := Blog{
		Locale:  "ZH",
		Subject: "subject",
		Body:    "body",
		Tags: []Tag{
			{Locale: "ZH", Value: "tag1"},
			{Locale: "ZH", Value: "tag2"},
		},
	}

	DB.Save(&blog)
	if !compareTags(blog.Tags, []string{"tag1", "tag2"}) {
		t.Fatalf("Blog should has two tags")
	}

	// Append
	tag3 := &Tag{Locale: "ZH", Value: "tag3"}

	user := *GetUser("update-many2many", Config{})

	if err := DB.Create(&user).Error; err != nil {
		t.Fatalf("errors happened when create: %v", err)
	}

	user.Languages = []Language{{Code: "zh-CN", Name: "Chinese"}, {Code: "en", Name: "English"}}
	for _, lang := range user.Languages {
		DB.Create(&lang)
	}
	user.Friends = []*User{{Name: "friend-1"}, {Name: "friend-2"}}