java - 将实体的元素添加到同一实体 - @OneToMany

Question

我的 Task 实体表示为:

@Entity
@Getter
@NoArgsConstructor
public class Task {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;
    @NotBlank
    private String name;
    @Enumerated(EnumType.STRING)
    private Category category;
    @OneToOne
    private Employee assignee;
    @OneToMany
    private List<Task> precedingTasks;
    private String details;
    private int estimatedTimeInMinutes;
    private LocalDateTime deadline;
    private LocalDateTime creationTime;
    private LocalDateTime startTime;
    private LocalDateTime endTime;

    public Task(String name, Category category, Employee assignee, List<Task> precedingTasks, String details,
                int estimatedTimeInMinutes, LocalDateTime deadline) {
        this.name = name;
        this.category = category;
        this.assignee = assignee;
        this.precedingTasks = precedingTasks;
        this.details = details;
        this.estimatedTimeInMinutes = estimatedTimeInMinutes;
        this.deadline = deadline;
        this.creationTime = LocalDateTime.now();
        this.startTime = null;
        this.endTime = null;
    }

我注意到没有 precedingTasks 的任务可以正确添加，但没有。

例如:添加三个没有 precedingTasks 的任务后，我在 Postman 中发送 POST，如下所示:

{
    "name": "Wyslac przesyłke nr 87",
    "category": "TODO",
    "assigneeId": 1,
    "precedingTasksId": [1, 2, 3],
    "details": "Dodac zakladke",
    "estimatedTimeInMinutes": 78,
    "deadline": "2013-12-18T14:30:40.100000000"
}

但是我得到了一个没有之前的任务的任务:

{
    "id": 4,
    "name": "Wyslac przesyłke nr 87",
    "category": "TODO",
    "assignee": {
        "id": 1,
        "firstName": "Wojciech",
        "lastName": "Wasilewski",
        "email": "wojtek@wasilewski.pl",
        "role": "ADMIN",
        "password": "h*n$GvFE",
        "manager": true,
        "password_LENGTH": 8,
        "passwordValid": false
    },
    "precedingTasks": [],
    "details": "Dodac zakladke",
    "estimatedTimeInMinutes": 78,
    "deadline": "2013-12-18T14:30:40.1",
    "creationTime": "2018-08-01T13:38:45.924",
    "startTime": null,
    "endTime": null
}

我使用这个 Controller :

@PostMapping("/tasks")
@ResponseStatus(HttpStatus.CREATED)
public Task addNewTask(@RequestBody TaskRequest taskRequest) {
    String name = taskRequest.getName();
    Category category = taskRequest.getCategory();
    checkIfAssigneeExists(taskRequest.getAssigneeId());
    Employee assignee = employeeRepository.findById(taskRequest.getAssigneeId()).get();
    List<Task> precedingTasks = new ArrayList<>();

    if (taskRequest.getPrecedingTaskIds() != null)
        taskRequest.getPrecedingTaskIds().forEach(id -> precedingTasks.add(taskRepository.findById(id).get()));

    String details = taskRequest.getDetails();
    int estimatedTimeInMinutes = taskRequest.getEstimatedTimeInMinutes();
    LocalDateTime deadline = taskRequest.getDeadline();
    Task task = new Task(name, category, assignee, precedingTasks, details, estimatedTimeInMinutes, deadline);
    taskRepository.save(task);
    return task;
}

还有这样的请求:

@Data
@NoArgsConstructor
@AllArgsConstructor
public class TaskRequest {

    @NonNull
    private String name;

    @NonNull
    private Category category;

    @NonNull
    private Long assigneeId;

    @NonNull
    private List<Long> precedingTaskIds;

    private String details;
    private int estimatedTimeInMinutes;

    @NonNull
    private LocalDateTime deadline;
}

出了什么问题？ Controller ，还是 JSON 中 ArrayList 的格式？在添加整个任务之前，我应该将 precedingTasks 添加到数据库吗？

Answer 1

类TaskRequest中的字段precedingTaskIds在名称上与POST请求precedingTasksId中的字段不对应。重命名或在 Postman 中重写 POST。