Question

@Document(collection="users")
public class User{
  @Id
  private int id;

  private String name;
  ...
  //getters-setters
}

@Document(collection="models")
public class Model{
  @Id
  private int id;
  private String name;
  @DBRef
  private List<User> users;
  ...
  //getters-setters
}

我试过这个解决方案，但它不会返回任何内容：

QModel model = new QModel（）; Pageable pageable = new PageRequest（0,100）;

返回modelsRepository.findAll（model.users.any（）。id.eq（anUserId），pageable）;

Answer 1

我认为这完全取决于MongoDB集合中的JSON数据。

在您的情况下，＆＃34;模型＆＃34;集合应具有＆＃34;用户＆＃34;的属性。阵列。只要密钥名称匹配（即＆＃34;用户＆＃34;），它就应该有效。

详细示例： -

以下示例正常。

人物收藏： -

{
    "_id" : ObjectId("57c8269b3ee7df409d4d2b64"),
    "name" : "Erin",
    "places" : [ 
        {
            "$ref" : "places",
            "$id" : ObjectId("57c813b33ee7df409d4d2b58")                
        }
    ],
    "url" : "bc.example.net/Erin"
}

地方收藏： -

{
    "_id" : ObjectId("57c813b33ee7df409d4d2b58"),
    "name" : "Broadway Center",
    "url" : "bc.example.net"
}

<强>类： -

地方课程： -

@Document(collection = "places")
public class Places implements Serializable {

    private static final long serialVersionUID = -5500334641079164017L;

    @Id
    private String id;

    private String name;

    private String url;

    ...get and setters
}

人员类： -

@Document(collection = "people")
public class People implements Serializable {

    private static final long serialVersionUID = 6308725499894643034L;

    @Id
    private String id;

    private String name;

    @DBRef
    private List<Places> places;

    private String url;

    ...get and setters
}

存储库类： -

@Repository
public interface PeopleRepository extends PagingAndSortingRepository<People, String> {

    public People findById(String id);

    @Query(value = "{ 'status' : ?0 }")
    public Page<People> findByStatus(String status, Pageable pageable);

}

<强>的FindAll： -

public Boolean findAllPeople() {

        Page<People> peoplePage = peopleRepository.findAll(new PageRequest(0, 20));

        System.out.println("Total elements :" + peoplePage.getTotalElements());

        for (People people : peoplePage) {
            System.out.println("People id :" + people.getId());
            System.out.println("Place size :" + people.getPlaces().size());
            people.getPlaces().forEach(p -> System.out.println(p.getName()));
        }

        return true;

    }

Spring MongoDB + QueryDSL查询由@DBRef相关列表

1 个答案: