Spring Boot MongoRepository findAll() 返回空数组

Question

我有一个连接到本地 Mongo 数据库的 Spring Boot 应用程序，但是当我尝试通过请求 http://localhost:8080/api/v1/users 从集合中获取所有文档时，它返回一个空数组。我也没有任何连接错误。我已经读到问题可能出在集合名称上，但是当我指定集合名称时（现在 MongoDB 中的集合名称与模型中的相同），它仍然返回一个空数组。还有什么问题？

型号：

@Document(collection = "users")
public class User {

    @Id
    private String id;

    private String username;
    private String email;
    private String password;
    private String birthdate;

    private int chest;
    private int weight;
    private int height;
    private boolean gender;

    // constructors, getters and setters omitted
}

控制器：

@RestController
@RequestMapping("api/v1/users")
public class UserController {

    private final UserService userService;

    @Autowired
    public UserController(UserService userService) {
        this.userService = userService;
    }

    @GetMapping
    public List<User> findAll() {
        return userService.find();
    }
}

服务：

@Service
public class UserService {

    @Autowired
    private UserRepository userRepository;

    public List<User> find() {
        return userRepository.findAll();
    }
}

存储库：

public interface UserRepository extends MongoRepository<User, String> {
    public User findByEmail(String email);
}

直接来自 MongoDB：

> db.users.find().pretty()
{
    "_id" : ObjectId("60002a15803d9027a459b7b6"),
    "username" : "name",
    "email" : "zaaas@sasasfa.aaa",
    "birthdate" : "1999-10-2",
    "weight" : 67,
    "height" : 175,
    "chest" : 87,
    "gender" : true,
    "__v" : 0
}
{
    "_id" : ObjectId("60002be21da6d929fa45c9f2"),
    "username" : "aye",
    "email" : "zaaas@sasasfsdsa.aaa",
    "birthdate" : "1999-10-2",
    "weight" : 65,
    "height" : 180,
    "chest" : 80,
    "gender" : true,
    "__v" : 0
}

编辑

问题出在我的连接属性上。

之前：

# application.yml, started using yaml just for better readability,
# should work as fine with application.properties
spring:
  data:
    mongodb:
      url: mongodb://localhost:27017/{dbname}

之后：

# application.yml
spring:
  data:
    mongodb:
      host: localhost
      port: 27017
      database: {dbname}

Answer 1

出现问题是因为您的模型中没有明确给出集合名称。您可以像下面这样更改代码

@Document(collection = "User")
public class User {

    @Id
    private String id;

    private String username;
    private String email;
    private String password;
    private String birthdate;

    private int chest;
    private int weight;
    private int height;
    private boolean gender;

    // constructors, getters and setters omitted
}