return err
		}

		// convert join identity map to relation identity map
		fieldValues := make([]interface{}, len(joinForeignFields))
		joinFieldValues := make([]interface{}, len(joinRelForeignFields))
		for i := 0; i < joinResults.Len(); i++ {
			joinIndexValue := joinResults.Index(i)
			for idx, field := range joinForeignFields {
				fieldValues[idx], _ = field.ValueOf(tx.Statement.Context, joinIndexValue)
			}

		}

		if len(bytes) > 0 {
			err = json.Unmarshal(bytes, fieldValue.Interface())
		}
	}

	field.ReflectValueOf(ctx, dst).Set(fieldValue.Elem())
	return
}

// Value implements serializer interface
func (JSONSerializer) Value(ctx context.Context, field *Field, dst reflect.Value, fieldValue interface{}) (interface{}, error) {
	result, err := json.Marshal(fieldValue)
	if string(result) == "null" {

						}

						fieldValue = reflect.New(newFieldType)
						if rvType != reflect.Indirect(fieldValue).Type() {
							getRealFieldValue(fieldValue)
						}

						if fieldValue.IsValid() {
							return
						}
					}
				}
			}

			getRealFieldValue(fieldValue)
		}
	}

	if v, isSerializer := fieldValue.Interface().(SerializerInterface); isSerializer {

	changed := func(field *schema.Field) bool {
		fieldValue, _ := field.ValueOf(stmt.Context, modelValue)
		if v, ok := selectColumns[field.DBName]; (ok && v) || (!ok && !restricted) {
			if mv, mok := stmt.Dest.(map[string]interface{}); mok {
				if fv, ok := mv[field.Name]; ok {
					return !utils.AssertEqual(fv, fieldValue)
				} else if fv, ok := mv[field.DBName]; ok {

		return err
	}

	return fc(stmt)
}

// DataTypeOf return field's db data type
func (m Migrator) DataTypeOf(field *schema.Field) string {
	fieldValue := reflect.New(field.IndirectFieldType)
	if dataTyper, ok := fieldValue.Interface().(GormDataTypeInterface); ok {
		if dataType := dataTyper.GormDBDataType(m.DB, field); dataType != "" {
			return dataType
		}
	}

	return m.Dialector.DataTypeOf(field)

type Reference struct {
	PrimaryKey    *Field
	PrimaryValue  string
	ForeignKey    *Field
	OwnPrimaryKey bool
}

func (schema *Schema) parseRelation(field *Field) *Relationship {
	var (
		err        error
		fieldValue = reflect.New(field.IndirectFieldType).Interface()
		relation   = &Relationship{
			Name:        field.Name,
			Field:       field,
			Schema:      schema,
			foreignKeys: toColumns(field.TagSettings["FOREIGNKEY"]),