方法GET的结果带来所有关系和子关系

Question

我有一个有列表屏幕的应用程序

我在API Spring Boot中正在执行一种方法

类控制器

@RequestMapping(method = RequestMethod.GET, value = "/distritos", produces = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<Collection<Distritos>> buscarTodosDistritos() {
        Collection<Distritos> distritosBuscados = distritosService.buscarTodos();
            return new ResponseEntity<>(distritosBuscados, HttpStatus.OK);
    } 

班级服务

public Collection<Distritos> buscarTodos(){
                return distritosRepository.findAll();
            } 

类库

@Repository
public interface DistritosRepository extends JpaRepository<Distritos, Integer> {

} 

类实体

@Entity
@Table(name = "distritos", schema="glb")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "Distritos.findAll", query = "SELECT d FROM Distritos d"),
    @NamedQuery(name = "Distritos.findByIdDistrito", query = "SELECT d FROM Distritos d WHERE d.idDistrito = :idDistrito"),
    @NamedQuery(name = "Distritos.findByNome", query = "SELECT d FROM Distritos d WHERE d.nome = :nome"),
    @NamedQuery(name = "Distritos.findByCodigoDne", query = "SELECT d FROM Distritos d WHERE d.codigoDne = :codigoDne"),
    @NamedQuery(name = "Distritos.findByFlagAtivo", query = "SELECT d FROM Distritos d WHERE d.flagAtivo = :flagAtivo")})



@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "idDistrito", scope= Distritos.class)        
public class Distritos implements Serializable {

    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "id_distrito")
    private int idDistrito;


    @Basic(optional = false)
    @NotNull
    @Size(min = 1, max = 70)
    @Column(name = "nome")
    private String nome;


    @Size(max = 8)
    @Column(name = "codigo_dne")
    private String codigoDne;


    @Column(name = "flag_ativo")
    private Integer flagAtivo;


    @JoinColumn(name="idEntidade")
    @ManyToOne
    private Entidades entidade;


    @JoinColumn(name="idMunicipio")
    @ManyToOne(optional = false)
    private Municipios municipio;


    @JoinColumn(name="idUf")
    @ManyToOne(optional = false)
    private Ufs uf;

    public Distritos() {
    }

   gets and sets....
   } 

在前端的js中，我有这个

carregarDados = function() {

        token = localStorage.getItem("userToken");

        $http({
            method : 'GET',
            url : 'http://localhost:8080/user/distritos'
        }).then(function(response) {
            $scope.distritos = response.data;

        }, function(response) {
            console.log(response.data);
            console.log(response.status);
        });
    }; 

问题在于，GET方法的返回带来了所有关系，从而导致了过多的延迟及其子关系，因为我只需要Estado的名称，Municipio的名称和Eentidade的名称。

奇怪的是，数组第二个列表的结果恰好带来了我所需的信息，而没有子关系。

看图片。

Answer 1

错误出在我的相关类中，例如在municipio，entidade和uf中，我有一个@OneToMany映射，在这些类中有更多@OneToMany映射是不必要的。 因此，当我在Distrito中执行GET ，我对所有映射（包括不必要的双向映射）都做出了响应，从而导致运行缓慢。