java - Spring Boot API 响应返回重复的嵌套 JSON

问题描述

我有一个User模型和一个TodoItem模型，其中模型有一个带有@joincolumnTodoItem的模型的主键。我的问题是添加项目后从 API 获得的响应。它创建了这个超长的嵌套 JSON，它会一遍又一遍地重复自己。我觉得我没有正确处理主键情况。Useruser_idgetUsers

TodoController.java

@RestController
@RequestMapping("/api")
public class TodoController {

@Autowired
private TodoRepository todoRepository;

@PostMapping("/addItem")
public TodoItem addTodoItem(@RequestBody TodoItem todoItem) {
    return todoRepository.save(todoItem);
}

用户.java

@Entity
@Table(name = "users")
public class User {

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

@Column(name = "name")
private String name;

@Column(name = "password")
private String password;

@OneToMany(cascade = CascadeType.ALL, mappedBy = "user")
private List<TodoItem> todos;

public User() {
}

public User(String name, String password, List<TodoItem> todos) {
    this.name = name;
    this.password = password;
    this.todos = todos;
}
// setter and getters

TodoItem.java

@Entity
@Table(name = "todo_item")
public class TodoItem {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private long id;

@Column(name = "todo")
private String todo;

@Column(name = "completed")
private boolean completed;

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "user_id")
private User user;

public TodoItem() {
}

public TodoItem(String todo, boolean completed) {
    this.todo = todo;
    this.completed = completed;
}
// setters and getters

添加项目请求

{
  "todo": "blahblah",
  "completed": false,
  "user": {
      "id": 6
  }
}

添加项目响应

{
  "id": 26,
  "todo": "blahblah",
  "completed": false,
  "user": {
      "id": 6,
      "name": null,
      "password": null,
      "todos": null
  }

}

所以我已经不喜欢给出响应的方式了，为什么当 id 为 6 的用户存在时，name、pass 和 todos 为 null，我也只是给它传递了一个 todoitem，所以为什么 todo 为 null。数据库正确填充，只是响应似乎错误。然后我认为它与我在这里遇到的主要问题有关；这是在我向用户添加项目之后：

获取用户响应

[
{
    "id": 6,
    "name": "joe",
    "password": "pass",
    "todos": [
        {
            "id": 26,
            "todo": "blahblah",
            "completed": false,
            "user": {
                "id": 6,
                "name": "joe",
                "password": "pass",
                "todos": [
                    {
                        "id": 26,
                        "todo": "blahblah",
                        "completed": false,
                        "user": {
                            "id": 6,
                            "name": "joe",
                            "password": "pass",
                            "todos": [
                                {
                                    "id": 26,
                                    "todo": "blahblah",
                                    "completed": false,
                                    "user": {
                                        "id": 6,
                                        "name": "joe",
                                        "password": "pass",
                                        "todos": [
                                            {
                                                "id": 26,
                                                "todo": "blahblah",
                                                "completed": false,
                                                "user": {
                                                    "id": 6,
                                                    "name": "joe",
                                                    "password": "pass",
                                                    "todos": [
                                                        {
                                                            "id": 26,
                                                            "todo": "blahblah",

它就这样持续了数千行。即使响应很疯狂，数据库也会正确更新，但由于此问题，API 调用可能需要一段时间

标签： javamysqlspringspring-bootapi

java - Spring Boot API 响应返回重复的嵌套 JSON

问题描述

解决方案

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