// RegisterSerializer register serializer
func RegisterSerializer(name string, serializer SerializerInterface) {
	serializerMap.Store(strings.ToLower(name), serializer)
}

// GetSerializer get serializer
func GetSerializer(name string) (serializer SerializerInterface, ok bool) {
	v, ok := serializerMap.Load(strings.ToLower(name))
	if ok {
		serializer, ok = v.(SerializerInterface)
	}
	return serializer, ok
}

func init() {

	if field.IgnoreMigration {
		return nil
	}

	// found, smart migrate
	fullDataType := strings.TrimSpace(strings.ToLower(m.DB.Migrator().FullDataTypeOf(field).SQL))
	realDataType := strings.ToLower(columnType.DatabaseTypeName())

	var (
		alterColumn bool
		isSameType  = fullDataType == realDataType
	)

	if !field.PrimaryKey {
		// check type

	}

	AssertEqual(t, "varchar", strings.ToLower(ct.DatabaseTypeName()))

	err = DB.Table("diff_types").AutoMigrate(&DiffType1{})
	if err != nil {
		t.Errorf("AutoMigrate err:%v", err)
	}

	ct, err = findColumnType(&DiffType{}, "name")
	if err != nil {
		t.Errorf("findColumnType err:%v", err)
	}

	AssertEqual(t, "text", strings.ToLower(ct.DatabaseTypeName()))
}

	}

	if field.GORMDataType == "" {
		field.GORMDataType = field.DataType
	}

	if val, ok := field.TagSettings["TYPE"]; ok {
		switch DataType(strings.ToLower(val)) {
		case Bool, Int, Uint, Float, String, Time, Bytes:
			field.DataType = DataType(strings.ToLower(val))
		default:
			field.DataType = DataType(val)
		}
	}

	if field.Size == 0 {
		switch reflect.Indirect(fieldValue).Kind() {

	conds = append(conds, clause.IN{Column: column, Values: values})
	return
}

func copyableDataType(str DataType) bool {
	for _, s := range []string{"auto_increment", "primary key"} {
		if strings.Contains(strings.ToLower(string(str)), s) {
			return false
		}
	}
	return true