func (db *DB) AutoMigrate(dst ...interface{}) error {
	return db.Migrator().AutoMigrate(dst...)
}

// ViewOption view option
type ViewOption struct {
	Replace     bool   // If true, exec `CREATE`. If false, exec `CREATE OR REPLACE`
	CheckOption string // optional. e.g. `WITH [ CASCADED | LOCAL ] CHECK OPTION`
	Query       *DB    // required subquery.
}

// ColumnType column type interface
type ColumnType interface {
	Name() string

	}

	type ColumnStruct2 struct {
		gorm.Model
		Name         string
		StringBool   bool // change existing boolean column from string to boolean
		SmallintBool bool // change existing boolean column from smallint or other to boolean
	}

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

	if err := DB.AutoMigrate(&ColumnStruct{}); err != nil {
		t.Errorf("Failed to migrate, got %v", err)
	}

			[]interface{}{"1", "jinzhu", 18},
		},
		{
			[]clause.Interface{clause.Select{}, clause.From{}, clause.Where{
				Exprs: []clause.Expression{clause.Or(clause.Eq{Column: clause.PrimaryColumn, Value: "1"}), clause.Or(clause.Neq{Column: "name", Value: "jinzhu"})},
			}},
			"SELECT * FROM `users` WHERE `users`.`id` = ? OR `name` <> ?",
			[]interface{}{"1", "jinzhu"},
		},
		{

	user2 := User{Name: "ScanRowsUser2", Age: 10}
	user3 := User{Name: "ScanRowsUser3", Age: 20}
	DB.Save(&user1).Save(&user2).Save(&user3)

	rows, err := DB.Table("users").Where("name = ? or name = ?", user2.Name, user3.Name).Select("name, age").Rows()
	if err != nil {
		t.Errorf("Not error should happen, got %v", err)
	}

	type Result struct {
		Name string
		Age  int
	}

	createCallback.Register("gorm:save_after_associations", SaveAfterAssociations(true))
	createCallback.Register("gorm:after_create", AfterCreate)
	createCallback.Match(enableTransaction).Register("gorm:commit_or_rollback_transaction", CommitOrRollbackTransaction)
	createCallback.Clauses = config.CreateClauses

	queryCallback := db.Callback().Query()
	queryCallback.Register("gorm:query", Query)

		names = append(names, embeddedValues(relations)...)
	}
	return names
}

// preloadEntryPoint enters layer by layer. It will call real preload if it finds the right entry point.
// If the current relationship is embedded or joined, current query will be ignored.
//
//nolint:cyclop
func preloadEntryPoint(db *gorm.DB, joins []string, relationships *schema.Relationships, preloads map[string][]interface{}, associationsConds []interface{}) error {

			}
		} else {
			stmt.AddError(ErrInvalidField)
		}
	} else {
		stmt.AddError(ErrInvalidField)
	}
}

// Changed check model changed or not when updating
func (stmt *Statement) Changed(fields ...string) bool {
	modelValue := stmt.ReflectValue
	switch modelValue.Kind() {
	case reflect.Slice, reflect.Array:

	if !regexp.MustCompile(`WHERE \(\(a = .+ or b = .+\) OR \(c = .+ and d = .+\) OR \(e = .+ and f = .+\)\) AND .users.\..deleted_at. IS NULL`).MatchString(sql) {
		t.Fatalf("invalid sql generated, got %v", sql)
	}

	}
}

func Or(exprs ...Expression) Expression {
	if len(exprs) == 0 {
		return nil
	}
	return OrConditions{Exprs: exprs}
}

type OrConditions struct {
	Exprs []Expression
}

func (or OrConditions) Build(builder Builder) {
	if len(or.Exprs) > 1 {
		builder.WriteByte('(')
		buildExprs(or.Exprs, builder, OrWithSpace)
		builder.WriteByte(')')
	} else {

		t.Fatalf("Build OR condition, but got %v", result.Statement.SQL.String())
	}

	result = dryDB.Where("role = ?", "admin").Where(DB.Or("role = ?", "super_admin").Or("role = ?", "admin")).Find(&User{})
	if !regexp.MustCompile("SELECT \\* FROM .*users.* WHERE .*role.* = .+ AND (.*role.* = .+ OR .*role.* = .+)").MatchString(result.Statement.SQL.String()) {
		t.Fatalf("Build OR condition, but got %v", result.Statement.SQL.String())