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)
			}

			var fieldValue reflect.Value
			if clear {
				fieldValue = reflect.MakeSlice(oldFieldValue.Type(), 0, oldFieldValue.Cap())
			} else {
				fieldValue = reflect.MakeSlice(oldFieldValue.Type(), oldFieldValue.Len(), oldFieldValue.Cap())
				reflect.Copy(fieldValue, oldFieldValue)
			}

			appendToFieldValues := func(ev reflect.Value) {

						}

						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)

					return schema, schema.err
				} else {
					schema.FieldsByName[field.Name] = field
					schema.FieldsByBindName[field.BindName()] = field
				}
			}

			fieldValue := reflect.New(field.IndirectFieldType)
			fieldInterface := fieldValue.Interface()
			if fc, ok := fieldInterface.(CreateClausesInterface); ok {
				field.Schema.CreateClauses = append(field.Schema.CreateClauses, fc.CreateClauses(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"]),