如何通过 Postman 修复 Spring 引导（一对多、一对一）中的更新过程？

Question

我在更新电影时遇到问题。

我在 MovieService 中写了一个名为“更新”的函数。

这是下面显示的函数。

public void update(Long id,Movie movie) {

        boolean isUpdatingEmployee = (movie.getId() == id);

        if (isUpdatingEmployee) {
            Movie existingMovie = movieRepository.findById(movie.getId()).get();

            existingMovie.setId(id);
            existingMovie.setName(movie.getName());
            existingMovie.setRating(movie.getRating());
            existingMovie.setDirector(movie.getDirector());
            existingMovie.setGenres(movie.getGenres());
            existingMovie.setCreatedAt(movie.getCreatedAt());

            movieRepository.save(existingMovie);
        }

    }

当我尝试在保存电影后更新它时，我得到了这种 JSON 结果，这就是无法完成更新过程的原因。

http://localhost:8082/api/v1/movie/update/1

正文请求

{
    "name": "MovieC",
    "genres": [
        { 
            "name" : "Adventure"
        },
        {
            "name" : "Action"
        }
    ],
    "createdAt": "2021-04-28",
    "rating" : 9,
    "director" : {
        "name" : "Director 2"
    }     
}

更新流程后 JSON 的结果。

{
    "id": null,
    "name": "MovieC",
    "genres": [
        {
            "id": null,
            "name": "Action"
        },
        {
            "id": null,
            "name": "Adventure"
        }
    ],
    "rating": 9.0,
    "createdAt": "2021-04-28",
    "director": {
        "id": null,
        "name": "Director 2"
    }
}

这是我的电影实体，如下所示。

@Entity
@Getter
@Setter
@ToString
@AllArgsConstructor
@NoArgsConstructor
public class Movie implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String name;

    @JsonManagedReference
    @OneToMany(mappedBy="movie",cascade = CascadeType.ALL,fetch = FetchType.EAGER)
    private Set<Genre> genres;

    private Double rating;

    private LocalDate createdAt;


    @ManyToOne(cascade=CascadeType.ALL,fetch = FetchType.EAGER)
    @JoinColumn
    private Director director;
}

这是我的 Director 实体，如下所示。

@Entity
@Getter
@Setter
@ToString
@RequiredArgsConstructor
@NoArgsConstructor
@JsonIgnoreProperties({"movies"})
public class Director implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @NonNull
    private String name;

    @OneToMany(mappedBy="director",cascade = CascadeType.ALL,fetch = FetchType.EAGER)
    private Set<Movie> movies;
}

这是我的流派实体，如下所示。

@Entity
@Getter
@Setter
@ToString
@RequiredArgsConstructor
@NoArgsConstructor
@JsonIgnoreProperties({"movie"})
public class Genre implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @NonNull
    private String name;

    @JsonBackReference
    @ManyToOne(cascade = CascadeType.ALL,fetch = FetchType.EAGER)
    @JoinColumn
    private Movie movie;
}

这是我的示例项目 link : Project Link

我该如何解决？

Answer 1

我认为问题是因为您返回的对象电影与您在控制器的 post 方法主体中传递的相同 - https://github.com/Rapter1990/springboothazelcast/blob/3157f354a628d418cccb99cfdbd188f594c24e9c/src/main/java/com/springboot/hazelcast/controller/MovieController.java#L64

你应该把它重写成这样：

    @PostMapping("/save")
    public Movie saveMovie(@RequestBody Movie movie) throws ParseException {
        LOG.info("MovieController | Saving Movie.");
        return movieService.save(movie);
    }

这是 CRUDRepository javadoc 的 link： https://docs.spring.io/spring-data/commons/docs/current/api/org/springframework/data/repository/CrudRepository.html#save-S-

Answer 2

根据您的代码，这是您的请求：

http://localhost:8082/api/v1/movie/update/1

{
    "name": "MovieC",
    "genres": [
        { 
            "name" : "Adventure"
        },
        {
            "name" : "Action"
        }
    ],
    "createdAt": "2021-04-28",
    "rating" : 9,
    "director" : {
        "name" : "Director 2"
    }     
}

现在考虑您代码中的这个片段：

public void update(Long id,Movie movie) {
    boolean isUpdatingEmployee = (movie.getId() == id);
    if (isUpdatingEmployee) {
    ...

您的 id 将是 1，因为您已经在路径变量中设置了它。但是，movie.getId() 将为空，因为我在您的 RequestBody.

中看不到它

等等：

isUpdatingEmployee = (movie.getId() == id)` 
isUpdatingEmployee = (    null      ==  1)
isUpdatingEmployee = false

这将始终为您提供 false，所以我认为这不会进入您的更新逻辑。

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