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Spring MongoDB QueryDSL查询由@DBRef相关列表

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@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，但它没有返回任何东西：

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

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

spring mongodb spring-data querydsl dbref

1 回答

  • 0

    我认为这完全取决于MongoDB集合中的JSON数据 .

    在您的情况下，“models”集合应该具有“users”数组的属性 . 只要密钥名称匹配（即“用户”），它就应该有效 .

    Detailed Example:-

    以下示例正常工作 .

    People Collection:-

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

    Places Collection:-

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

    Classes:-

    Places class:-

    @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
}

    People class:-

    @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
}

    Repository class:-

    @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);

}

    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;

    }
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