if !regexp.MustCompile("SELECT .* FROM .users. left join pets.*join accounts.*").MatchString(stmt.SQL.String()) {

	account2 := Account{Number: "account-has-one-replace"}

	if err := DB.Model(&user2).Association("Account").Replace(&account2); err != nil {
		t.Fatalf("Error happened when append Account, got %v", err)
	}

	if account2.ID == 0 {
		t.Fatalf("account2's ID should be created")
	}

	user.Account = account2
	CheckUser(t, user2, user)

	AssertAssociationCount(t, user2, "Account", 1, "AfterReplace")

	// Delete

		t.Errorf("should update two records, but got %v", rowsAffected)
	}

	var results []User

			t.Fatalf("errors happened when create: %v", err)
		}

		var account2 CustomizeAccount
		DB.Find(&account2, "user_id = ?", cusUser.ID)
		AssertEqual(t, account2.Number, number)
		AssertEqual(t, account2.Number2, cusUser.Account.Number2)
	})

	user.Birthday = nil
	user.Account = Account{}
	user.Toys = nil
	user.Manager = nil

	CheckUser(t, result, user)

	user2 := *GetUser("omit_create", Config{Account: true, Pets: 3, Toys: 3, Company: true, Manager: true, Team: 3, Languages: 3, Friends: 4})
	DB.Omit(clause.Associations).Create(&user2)

	var result2 User
	DB.Preload(clause.Associations).First(&result2, user2.ID)

	user2.Account = Account{}
	user2.Toys = nil

	AssertAssociationCount(t, user, "Pets", 2, "")

	// Append
	pet := Pet{Name: "pet-has-many-append"}

	if err := DB.Model(&user2).Association("Pets").Append(&pet); err != nil {
		t.Fatalf("Error happened when append account, got %v", err)
	}

	if pet.ID == 0 {
		t.Fatalf("Pet's ID should be created")
	}

	user.Pets = append(user.Pets, &pet)
	CheckUser(t, user2, user)

	AssertAssociationCount(t, user, "Pets", 3, "AfterAppend")

	})
}

func TestVariableRelation(t *testing.T) {
	var result struct {
		User
	}

	checkStructRelation(t, &result, Relation{
		Name: "Account", Type: schema.HasOne, Schema: "", FieldSchema: "Account",
		References: []Reference{
			{"ID", "", "UserID", "Account", "", true},
		},
	})

	checkStructRelation(t, &result, Relation{
		Name: "Company", Type: schema.BelongsTo, Schema: "", FieldSchema: "Company",

		{"user_speaks", "fk_user_speaks_user"},
		{"user_speaks", "fk_user_speaks_language"},
		{"user_friends", "fk_user_friends_user"},
		{"user_friends", "fk_user_friends_friends"},
		{"accounts", "fk_users_account"},
		{"users", "fk_users_team"},
		{"users", "fk_users_company"},
	} {
		if !DB.Migrator().HasConstraint(indexes[0], indexes[1]) {
			t.Fatalf("Failed to find index for many2many for %v %v", indexes[0], indexes[1])

		"ManagerID", "Active")

	t.Run("Account", func(t *testing.T) {
		AssertObjEqual(t, user.Account, expect.Account, "ID", "CreatedAt", "UpdatedAt", "DeletedAt", "UserID", "Number")

		if user.Account.Number != "" {
			if !user.Account.UserID.Valid {
				t.Errorf("Account's foreign key should be saved")
			} else {
				var account Account
				db(unscoped).First(&account, "user_id = ?", user.ID)

	}

	var users2 []User
	DB.Preload("Account", clause.Eq{Column: "number", Value: users[0].Account.Number}).Find(&users2, "id IN ?", userIDs)
	sort.Slice(users2, func(i, j int) bool {
		return users2[i].ID < users2[j].ID
	})

	for idx, user := range users2[1:2] {
		if user.Account.Number != "" {
			t.Errorf("No account should found for user %v but got %v", idx+2, user.Account.Number)
		}
	}