MongoDB上具有整数值的持久集

Question

我有一个通知类，其中包含一个Set

当我尝试对扩展了MongoRepository的Notification到INotificationRepository的实例执行插入操作时

如何将枚举的值字段持久化到MongoDB？

@Document
@Getter
@Setter
@AllArgsConstructor
@NoArgsConstructor
public class Notification {
    @Id
    private String id;

    @Indexed
    private Set<NotificationType> notificationType;
}

@AllArgsConstructor
@Getter
public enum NotificationType {
    FEED(0,"Feed"),
    SMS(1, "Sms"),
    EMAIL(2, "Email"),
    NOTIFICATION(3, "Notification");

    private final Integer value;
    private final String text;
}




Answer 1

我通常不使用MongoDB，但也许您可以使用AttributeConverter
例如：

@Converter
public class NotificationTypeConverter implements AttributeConverter<Notification, Integer> {
    @Override
    public Integer convertToDatabaseColumn(NotificationType attribute) {
        if (attribute == null) {
            return null;
        }
        return attribute.getValue();
    }

    @Override
    public NotificationType convertToEntityAttribute(Integer dbData) {
       // convert from Integer to enum
    }
}

并添加@Convert到通知Type字段：

@Convert(converter = NotificationTypeConverter.class)
private Set<NotificationType> notificationType;