}

	if name := DB.Dialector.Name(); name == "postgres" {
		stmt := gorm.Statement{DB: DB}
		stmt.Parse(&Blog{})
		stmt.Schema.LookUpField("ID").Unique = true
		stmt.Parse(&Tag{})
		stmt.Schema.LookUpField("ID").Unique = true
		// postgers only allow unique constraint matching given keys
	}

				}
			}
		default:
			reflectValue := reflect.Indirect(reflect.ValueOf(arg))
			for reflectValue.Kind() == reflect.Ptr {
				reflectValue = reflectValue.Elem()
			}

			if s, err := schema.Parse(arg, stmt.DB.cacheStore, stmt.DB.NamingStrategy); err == nil {
				selectedColumns := map[string]bool{}
				if idx == 0 {
					for _, v := range args[1:] {
						if vs, ok := v.(string); ok {

		updatingSchema := stmt.Schema
		var isDiffSchema bool
		if !updatingValue.CanAddr() || stmt.Dest != stmt.Model {
			// different schema
			updatingStmt := &gorm.Statement{DB: stmt.DB}
			if err := updatingStmt.Parse(stmt.Dest); err == nil {
				updatingSchema = updatingStmt.Schema
				isDiffSchema = true
			}
		}

		switch updatingValue.Kind() {
		case reflect.Struct:

	db.Statement.Settings.Range(func(k, v interface{}) bool {
		tx.Statement.Settings.Store(k, v)
		return true
	})

	if err := tx.Statement.Parse(dest); err != nil {
		tx.AddError(err)
		return tx
	}
	tx.Statement.ReflectValue = reflectValue
	tx.Statement.Unscoped = db.Statement.Unscoped
	return tx
}

	Name2 string `gorm:"check:name <> 'jinzhu'"`
	Name3 string `gorm:"check:,name <> 'jinzhu'"`
}

func TestParseCheck(t *testing.T) {
	user, err := schema.Parse(&UserCheck{}, &sync.Map{}, schema.NamingStrategy{})
	if err != nil {
		t.Fatalf("failed to parse user check, got error %v", err)
	}

	results := map[string]schema.CheckConstraint{
		"name_checker": {
			Name:       "name_checker",
			Constraint: "name <> 'jinzhu'",

				schema.err = fmt.Errorf("failed to parse %s as default value for uint, got error: %v", field.DefaultValue, err)
			}
		}
	case reflect.Float32, reflect.Float64:
		field.DataType = Float
		if field.HasDefaultValue && !skipParseDefaultValue {
			if field.DefaultValueInterface, err = strconv.ParseFloat(field.DefaultValue, 64); err != nil {

		Result: "create table `users` (`id` int, `name` text)",
	}}

	for idx, result := range results {
		t.Run(fmt.Sprintf("case #%v", idx), func(t *testing.T) {
			user, _ := schema.Parse(&tests.User{}, &sync.Map{}, db.NamingStrategy)
			stmt := &gorm.Statement{DB: db, Table: user.Table, Schema: user, Clauses: map[string]clause.Clause{}}
			clause.Expr{SQL: result.SQL, Vars: result.Vars}.Build(stmt)

			return field
		}
	}
	return nil
}

type Tabler interface {
	TableName() string
}

type TablerWithNamer interface {
	TableName(Namer) string
}

// Parse get data type from dialector
func Parse(dest interface{}, cacheStore *sync.Map, namer Namer) (*Schema, error) {
	return ParseWithSpecialTableName(dest, cacheStore, namer, "")
}

func checkBuildClauses(t *testing.T, clauses []clause.Interface, result string, vars []interface{}) {
	var (
		buildNames    []string
		buildNamesMap = map[string]bool{}
		user, _       = schema.Parse(&tests.User{}, &sync.Map{}, db.NamingStrategy)
		stmt          = gorm.Statement{DB: db, Table: user.Table, Schema: user, Clauses: map[string]clause.Clause{}}
	)

	for _, c := range clauses {

	var (
		tx                      = db.getInstance()
		stmt                    = tx.Statement
		modelSchema, joinSchema *schema.Schema
	)

	err := stmt.Parse(model)
	if err != nil {
		return err
	}
	modelSchema = stmt.Schema

	err = stmt.Parse(joinTable)
	if err != nil {
		return err
	}
	joinSchema = stmt.Schema

	relation, ok := modelSchema.Relationships.Relations[field]