调用端点时如何在 MongoDB 中填充表？ - MongoDb，Spring Boot

Question

我正在将 Spring Boot 与 MongoDB 一起使用。我是 MongoDb 的初学者。

我想要实现的是当我在我的端点上接到电话时，或者当我的端点被请求时，我想在数据库中创建一个表，状态为REQUESTED，应用userID，然后是字段url、version、requestedDate（在创建表时填充）、completedDate（在将 URL 保存到数据库时填充）。

之后，我执行所有我必须做的逻辑，在我的情况下，我应该检索用户的 URL 并将其保存到发出 URL 请求时创建的同一个表中。

将 URL 保存在请求时创建的同一个表中后，我应该有 userId、url、version、requestedDate、completedDate 并声明为 COMPLETED。

到目前为止我的代码是：

UserUrl.java

public class UserUrl{
        public final MongoUserId mongoUserId;
        public final Optional<String> url;
        public final long version;
        public final Instant requestedDate;
        public final Instant completeDate;
        public final State state;
    
    
        public UserUrl(MongoUserId mongoUserId,
                       Optional<String> url,
                       long version,
                       Instant requestedDate,
                       State state) {
            this.mongoUserId = mongoUserId;
            this.url = url;
            this.version = version;
            this.requestedDate = requestedDate;
            this.state = state;
        }
    
        public static UserUrl create(MongoUserId mongoUserId){
            return new UserUrl(
                    mongoUserId,
                    Optional.empty(),
                    0,
                    Instant.now(),
                    State.REQUESTED
                    );
        }
    
        public UserUrl withUrl(String url){
            return new UserUrl(
                    this.mongoUserId,
                    Optional.of(url),
                    0,
                    Instant.now(),
                    State.COMPLETED
            );
        }
}

UserController.java

@RequestMapping(value = "/trigger/url/{userId}",
            method = RequestMethod.GET)
    public void getUrlForUser(@PathVariable("userId") String userId) {

        userUrlRepository.save(UserUrl.create(MongoUserId.of(userId)));

         URL getUrl = userDataService.getUrlUser(userId);
         String url = getUrl.toString();
         if (url != null) {
             
             //here I should probably do something to set withUrl method in model 

             return new ResponseEntity<>(url, HttpStatus.OK);
         } else {
            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
        }
    }

当我有URL 时，我不确定应该如何填充UserUrl 模型？

另外，如果我把completedDate 放在构造函数中，那么我想在创建时也有它，但是我应该对它应用什么值？

任何建议表示赞赏:)

Answer 1

您应该使用使用CrudRepository 持久化的实体，更新它并在需要时再次保存：

@RequestMapping(value = "/trigger/url/{userId}", method = RequestMethod.GET)
public void getUrlForUser(@PathVariable("userId") String userId) {

    UserUrl userUrl = userUrlRepository.save(UserUrl.create(MongoUserId.of(userId)));

    URL getUrl = userDataService.getUrlUser(userId);
    String url = getUrl.toString();
    if (url != null) {
        userUrlRepository.save(userUrl.withUrl(url));
        return new ResponseEntity<>(url, HttpStatus.OK);
    } else {
        return new ResponseEntity<>(HttpStatus.NOT_FOUND);
    }
}

编辑

要在完成后更改completeDate，即当url 属性已解析时，请更新withUrl 构建器方法以传播this.requestedDate 并将completeDate 初始化为Instant.now()：

public class UserUrl {

    public final MongoUserId mongoUserId;
    public final Optional<String> url;
    public final long version;
    public final Instant requestedDate;
    public final Instant completeDate;
    public final State state;


    public UserUrl(MongoUserId mongoUserId,
                   Optional<String> url,
                   long version,
                   Instant requestedDate,
                   Instant completeDate,
                   State state) {
        this.mongoUserId = mongoUserId;
        this.url = url;
        this.version = version;
        this.requestedDate = requestedDate;
        this.completeDate = completeDate;
        this.state = state;
    }

    public static UserUrl create(MongoUserId mongoUserId){
        return new UserUrl(
                mongoUserId,
                Optional.empty(),
                0,
                Instant.now(),
                null,
                State.REQUESTED
                );
    }

    public UserUrl withUrl(String url){
        return new UserUrl(
                this.mongoUserId,
                Optional.of(url),
                0,
                this.requestedDate,
                Instant.now(),
                State.COMPLETED
        );
    }
}