t.Fatalf("Got error when tried to create index: %+v", err)
	}

	if err := DB.Migrator().RenameIndex(&IndexStruct{}, "idx_index_structs_name", "idx_users_name_1"); err != nil {
		t.Fatalf("no error should happen when rename index, but got %v", err)
	}

	if !DB.Migrator().HasIndex(&IndexStruct{}, "idx_users_name_1") {
		t.Fatalf("Should find index for user's name after rename")
	}

	}

	want := []Level1{want1, want2}

	var got []Level1
	err := DB.Preload("Level2.Level3.Level4s").Find(&got).Error
	if err != nil {
		t.Error(err)
	}

	for _, level1 := range append(got, want...) {
		sort.Slice(level1.Level2.Level3.Level4s, func(i, j int) bool {
			return level1.Level2.Level3.Level4s[i].ID > level1.Level2.Level3.Level4s[j].ID
		})
	}

	if !reflect.DeepEqual(got, want) {

	result.Pets = append(user.Pets, result.Pets...)
	result.Team = append(user.Team, result.Team...)
	result.Friends = append(user.Friends, result.Friends...)

	sort.Slice(result.Pets, func(i, j int) bool {
		return result.Pets[i].ID < result.Pets[j].ID
	})

)

func TestScannerValuer(t *testing.T) {
	DB.Migrator().DropTable(&ScannerValuerStruct{})
	if err := DB.Migrator().AutoMigrate(&ScannerValuerStruct{}); err != nil {
		t.Fatalf("no error should happen when migrate scanner, valuer struct, got error %v", err)
	}

	data := ScannerValuerStruct{
		Name:     sql.NullString{String: "name", Valid: true},
		Gender:   &sql.NullString{String: "M", Valid: true},

	if err != nil {
		t.Errorf("Not error should happen, got %v", err)
	}

	type Result struct {
		Name string
		Age  int
	}

	var results []Result
	for rows.Next() {
		var result Result
		if err := DB.ScanRows(rows, &result); err != nil {
			t.Errorf("should get no error, but got %v", err)
		}
		results = append(results, result)
	}

	sort.Slice(results, func(i, j int) bool {

	}

	// Append
	DB.Model(&users).Association("Account").Append(
		&Account{Number: "account-slice-append-1"},
		&Account{Number: "account-slice-append-2"},
		&Account{Number: "account-slice-append-3"},
	)

	AssertAssociationCount(t, users, "Account", 3, "After Append")

	// Replace -> same as append

	// Delete

				switch result.Kind() {
				case reflect.Struct:
					reflectResults = reflect.Append(reflectResults, result.Addr())
				case reflect.Slice, reflect.Array:
					for i := 0; i < result.Len(); i++ {
						if elem := result.Index(i); elem.Kind() == reflect.Ptr {
							reflectResults = reflect.Append(reflectResults, elem)
						} else {
							reflectResults = reflect.Append(reflectResults, elem.Addr())
						}
					}
				}
			}
		}

	}

	for i := 0; i < config.Pets; i++ {
		user.Pets = append(user.Pets, &Pet{Name: name + "_pet_" + strconv.Itoa(i+1)})
	}

	for i := 0; i < config.Toys; i++ {
		user.Toys = append(user.Toys, Toy{Name: name + "_toy_" + strconv.Itoa(i+1)})
	}

	for i := 0; i < config.Tools; i++ {
		user.Tools = append(user.Tools, Tools{Name: name + "_tool_" + strconv.Itoa(i+1)})
	}

	if config.Company {

				if idx.Where == "" {
					idx.Where = index.Where
				}
				if idx.Comment == "" {
					idx.Comment = index.Comment
				}
				if idx.Option == "" {
					idx.Option = index.Option
				}

				idx.Fields = append(idx.Fields, index.Fields...)
				sort.Slice(idx.Fields, func(i, j int) bool {
					return idx.Fields[i].priority < idx.Fields[j].priority
				})

				indexes[index.Name] = idx
			}
		}
	}

	if err != nil {
		cacheStmt.prepareErr = err
		db.Mux.Lock()
		delete(db.Stmts, query)
		db.Mux.Unlock()
		return Stmt{}, err
	}

	db.Mux.Lock()
	cacheStmt.Stmt = stmt
	db.PreparedSQL = append(db.PreparedSQL, query)
	db.Mux.Unlock()

	return cacheStmt, nil
}

func (db *PreparedStmtDB) BeginTx(ctx context.Context, opt *sql.TxOptions) (ConnPool, error) {