func (d testDialector) Name() string                                   { return "test" }
func (d testDialector) Initialize(*gorm.DB) error                      { return nil }
func (d testDialector) Migrator(db *gorm.DB) gorm.Migrator             { return nil }
func (d testDialector) DataTypeOf(*schema.Field) string                { return "" }
func (d testDialector) DefaultValueOf(*schema.Field) clause.Expression { return clause.Expr{} }

	if DB.Dialector.Name() != "gaussdb" {
		t.Skip()
	}

	type Thing struct {
		gorm.Model
		SomeID  string
		OtherID string
		Data    string
	}

	DB.Migrator().DropTable(&Thing{})
	DB.Migrator().CreateTable(&Thing{})
	if err := DB.Exec("ALTER TABLE things ADD CONSTRAINT some_id_other_id_unique UNIQUE (some_id, other_id)").Error; err != nil {
		t.Error(err)
	}

	thing := Thing{

		t.Errorf("should returns record not found error, but got %v", err)
	}
}

func TestDeleteWithTable(t *testing.T) {
	type UserWithDelete struct {
		gorm.Model
		Name string
	}

	DB.Table("deleted_users").Migrator().DropTable(UserWithDelete{})
	DB.Table("deleted_users").AutoMigrate(UserWithDelete{})

	user := UserWithDelete{Name: "delete1"}
	DB.Table("deleted_users").Create(&user)

	var result UserWithDelete

		gorm.Model
		Name string
	}

	if err := DB.Migrator().RenameTable(&TableStruct{}, &NewTableStruct{}); err != nil {
		t.Fatalf("Failed to rename table, got error %v", err)
	}

	if !DB.Migrator().HasTable("new_table_structs") {
		t.Fatal("should found renamed table")
	}

	DB.Migrator().DropTable("new_table_structs")

	if DB.Migrator().HasTable(&NewTableStruct{}) {

	}
}

func TestUpdatesTableWithIgnoredValues(t *testing.T) {
	type ElementWithIgnoredField struct {
		Id           int64
		Value        string
		IgnoredField int64 `gorm:"-"`
	}
	DB.Migrator().DropTable(&ElementWithIgnoredField{})
	DB.AutoMigrate(&ElementWithIgnoredField{})

	elem := ElementWithIgnoredField{Value: "foo", IgnoredField: 10}
	DB.Save(&elem)

	DB.Model(&ElementWithIgnoredField{}).

	Serializer             SerializerInterface
	NewValuePool           FieldNewValuePool

	// In some db (e.g. MySQL), Unique and UniqueIndex are indistinguishable.
	// When a column has a (not Mul) UniqueIndex, Migrator always reports its gorm.ColumnType is Unique.
	// It causes field unnecessarily migration.
	// Therefore, we need to record the UniqueIndex on this column (exclude Mul UniqueIndex) for MigrateColumnUnique.
	UniqueIndex string
}

}

func TestRunCallbacks(t *testing.T) {
	DB.Migrator().DropTable(&Product{})
	DB.AutoMigrate(&Product{})

	p := Product{Code: "unique_code", Price: 100}
	DB.Save(&p)

	if !reflect.DeepEqual(p.GetCallTimes(), []int64{1, 1, 0, 1, 1, 0, 0, 0, 0}) {

	return fmt.Sprintf("%s%s", c.prefix, fieldValue), nil
}

func TestSerializer(t *testing.T) {
	schema.RegisterSerializer("custom", NewCustomSerializer("hello"))
	DB.Migrator().DropTable(adaptorSerializerModel(&SerializerStruct{}))
	if err := DB.Migrator().AutoMigrate(adaptorSerializerModel(&SerializerStruct{})); err != nil {
		t.Fatalf("no error should happen when migrate scanner, valuer struct, got error %v", err)
	}

	}

	dialectors := map[string]bool{"sqlite": true, "postgres": true, "gaussdb": true, "mysql": true, "sqlserver": true}
	if supported, found := dialectors[db.Dialector.Name()]; !(found && supported) {
		return
	}

	DB.Migrator().DropTable(&City{})

	if err = db.AutoMigrate(&City{}); err != nil {
		t.Fatalf("failed to migrate cities table, got error: %v", err)
	}

	err = db.Create(&City{Name: "Kabul"}).Error
	if err != nil {

	rand.Seed(time.Now().UnixNano())
	rand.Shuffle(len(allModels), func(i, j int) { allModels[i], allModels[j] = allModels[j], allModels[i] })

	DB.Migrator().DropTable("user_friends", "user_speaks")

	if err = DB.Migrator().DropTable(allModels...); err != nil {
		log.Printf("Failed to drop table, got error %v\n", err)
		os.Exit(1)
	}

	if err = DB.AutoMigrate(allModels...); err != nil {