[英]Reactive Spring Data Mongodb Query is returning old data when it should not
I am trying to only fetch newly created messages from a reactive Mongodb repository using Spring Data. 我正在尝试仅使用Spring Data从反应性Mongodb存储库中获取新创建的消息。
The client is fetching the messages via SSE. 客户端正在通过SSE获取消息。 I am using an "after"-query, which should only return messages which were sent after "LocalDateTime.now()".
我正在使用“之后”查询,该查询仅应返回在“ LocalDateTime.now()”之后发送的消息。
Unfortunately the SSE is pushing out old messages which are older than "now", too. 不幸的是,上证所也推出了比“现在”还早的旧消息。 I have no clue why it returns those old messages.
我不知道为什么它返回那些旧消息。
My controller method: 我的控制器方法:
@GetMapping(value = "/receiving-sse", produces = "text/event-stream")
public Flux<Message> streamEvents() {
Mono<String> username = getUsernameFromAuth();
Flux<Message> message = findOrCreateUser(username)
.flatMapMany(user -> messageRepository
.findAllBySenderIdOrReceiverIdAndSentAtAfter(user.getId(), user.getId(), LocalDateTime.now()));
Flux<Message> heartBeat = Flux.interval(Duration.ofSeconds(30)).map(sequence -> {
Message heartBeatMessage = new Message();
heartBeatMessage.setHeartbeat(true);
return heartBeatMessage;
});
return Flux.merge(message, heartBeat);
}
My repository: 我的资料库:
public interface MessageRepository extends ReactiveMongoRepository<Message, String> {
Flux<Message> findAllByReceiverId(String receiverId);
@Tailable
Flux<Message> findAllBySenderIdOrReceiverIdAndSentAtAfter(String senderId, String receiverId, LocalDateTime sentAt);
Flux<Message> findAllBySenderId(String senderId);
Flux<Message> findAllByIdIn(Collection<String> ids);
}
And my document: 而我的文件:
@Data
@Document
public class Message {
private String id;
private LocalDateTime sentAt;
private String message;
private boolean heartbeat;
@DBRef
private User sender;
@DBRef
private User receiver;
}
Any hints on why the repo is fetching messages that have a "sentAt" older than "LocalDateTime.now()" is much appreciated. 十分感谢有关回购为何要提取具有比“ LocalDateTime.now()”更旧的“ sentAt”的消息的任何提示。
Problem is in LocalDateTime.now()
. 问题出在
LocalDateTime.now()
。 LocalDateTime creates a time during initialization of a Flux<Message> message
variable. LocalDateTime在初始化
Flux<Message> message
变量期间创建一个时间。
You need to replace it with construction like Mono.defer()
. 您需要将其替换为
Mono.defer()
类的Mono.defer()
。 It will create LocalDateTime in every subscribe. 它将在每个订阅中创建LocalDateTime。
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