t.Error(err)
	}

	thing := Thing{
		SomeID:  "1234",
		OtherID: "1234",
		Data:    "something",
	}

	DB.Create(&thing)

	thing2 := Thing{
		SomeID:  "1234",
		OtherID: "1234",
		Data:    "something else",
	}

	result := DB.Clauses(clause.OnConflict{
		OnConstraint: "some_id_other_id_unique",

	}

	err = db.Create(&Museum{Name: "Eye Filmmuseum", CityID: city.ID}).Error
	if err != nil {
		t.Fatalf("failed to create museum: %v", err)
	}

	err = db.Create(&Museum{Name: "Dungeon", CityID: 123}).Error
	if !errors.Is(err, gorm.ErrForeignKeyViolated) {
		t.Fatalf("expected err: %v got err: %v", gorm.ErrForeignKeyViolated, err)
	}

		key    string
	}{
		{[]interface{}{"a"}, "a"},
		{[]interface{}{1, 2, 3}, "1_2_3"},
		{[]interface{}{1, nil, 3}, "1_nil_3"},
		{[]interface{}{[]interface{}{1, 2, 3}}, "[1 2 3]"},
		{[]interface{}{[]interface{}{"1", "2", "3"}}, "[1 2 3]"},
		{[]interface{}{[]interface{}{"1", nil, "3"}}, "[1 <nil> 3]"},
	}
	for _, c := range cases {
		if key := ToStringKey(c.values...); key != c.key {