} else if strings.ToUpper(v) == "MILLI" {
			field.AutoUpdateTime = UnixMillisecond
		} else {
			field.AutoUpdateTime = UnixSecond
		}
	}

	if field.GORMDataType == "" {
		field.GORMDataType = field.DataType
	}

	if val, ok := field.TagSettings["TYPE"]; ok {
		lowerVal := DataType(strings.ToLower(val))
		switch lowerVal {
		case Bool, Int, Uint, Float, String, Time, Bytes:

		// use same data type for foreign keys
		if copyableDataType(primaryKeyField.DataType) {
			relation.Polymorphic.PolymorphicID.DataType = primaryKeyField.DataType
		}
		relation.Polymorphic.PolymorphicID.GORMDataType = primaryKeyField.GORMDataType
		if relation.Polymorphic.PolymorphicID.Size == 0 {
			relation.Polymorphic.PolymorphicID.Size = primaryKeyField.Size
		}

		relation.References = append(relation.References, &Reference{

		f := joinSchema.LookUpField(ref.ForeignKey.DBName)
		if f == nil {
			return fmt.Errorf("missing field %s for join table", ref.ForeignKey.DBName)
		}

		f.DataType = ref.ForeignKey.DataType
		f.GORMDataType = ref.ForeignKey.GORMDataType
		if f.Size == 0 {
			f.Size = ref.ForeignKey.Size
		}
		ref.ForeignKey = f
	}

	for name, rel := range relation.JoinTable.Relationships.Relations {

			schema.FieldsWithDefaultDBValue = append(schema.FieldsWithDefaultDBValue, field)
		}

		if !embedded {
			if field.DataType == "" && field.GORMDataType == "" && (field.Creatable || field.Updatable || field.Readable) {
				relationshipFields = append(relationshipFields, field)
				schema.FieldsByName[field.Name] = field
				schema.FieldsByBindName[field.BindName()] = field