// ErrDuplicatedKey occurs when there is a unique key constraint violation
	ErrDuplicatedKey = errors.New("duplicated key not allowed")
	// ErrForeignKeyViolated occurs when there is a foreign key constraint violation
	ErrForeignKeyViolated = errors.New("violates foreign key constraint")
	// ErrCheckConstraintViolated occurs when there is a check constraint violation
	ErrCheckConstraintViolated = errors.New("violates check constraint")

				schema.err = fmt.Errorf("invalid polymorphic foreign keys %+v for %v on field %s", relation.foreignKeys,
					schema, field.Name)
			}
		}

		if primaryKeyField == nil {
			schema.err = fmt.Errorf("invalid polymorphic type %v for %v on field %s, missing primaryKey field",
				relation.FieldSchema, schema, field.Name)
			return
		}

		// use same data type for foreign keys
		if copyableDataType(primaryKeyField.DataType) {

	// unexist company id
	unexistCompanyID := company.ID + 9999999
	user = User{Name: "invalid-user-with-invalid-belongs-to-foreign-key", CompanyID: &unexistCompanyID}
	if err := DB.Create(&user).Error; err == nil {
		tidbSkip(t, "not support the foreign key feature")
		t.Errorf("should have gotten foreign key violation error")
	}
}

func TestBelongsToAssociationForSlice(t *testing.T) {
	users := []User{

		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)
				AssertObjEqual(t, account, user.Account, "ID", "CreatedAt", "UpdatedAt", "DeletedAt", "UserID",

stTime","deprecationHandler","arg","key","args","slice","join","Error","stack","keys","deprecations","deprecateSimple","name","isFunction","Function","mergeConfigs","parentConfig","childConfig","Locale","set","zeroFill","number","targetLength","forceSign","absNumber","Math","abs","zerosToFill","pow","max","substr","formattingTokens","localFormattingTokens","formatFunctions","formatTokenFunctions","addFormatToken","token","padded","ordinal","callback","func","localeData","formatMoment","expandFor...

	if !errors.Is(err, gorm.ErrDuplicatedKey) {
		t.Fatalf("expected err: %v got err: %v", gorm.ErrDuplicatedKey, err)
	}
}

func TestSupportedDialectorWithErrForeignKeyViolated(t *testing.T) {
	tidbSkip(t, "not support the foreign key feature")

	type City struct {
		gorm.Model
		Name string `gorm:"unique"`
	}

	type Museum struct {
		gorm.Model
		Name   string `gorm:"unique"`
		CityID uint

			}
		}

		// save associations
		if association.saveAssociation( /*clear*/ true, values...); association.Error != nil {
			return association.Error
		}

		// set old associations's foreign key to null
		switch rel.Type {
		case schema.BelongsTo:
			if len(values) == 0 {
				updateMap := map[string]interface{}{}
				switch reflectValue.Kind() {
				case reflect.Slice, reflect.Array:

			fieldValues[idx], _ = field.ValueOf(tx.Statement.Context, elem)
		}

		datas, ok := identityMap[utils.ToStringKey(fieldValues...)]
		if !ok {
			return fmt.Errorf("failed to assign association %#v, make sure foreign fields exists", elem.Interface())
		}

		for _, data := range datas {
			reflectFieldValue := rel.Field.ReflectValueOf(tx.Statement.Context, data)