实体类的属性是一个List (OneToMany关系), 前端如何将数据一次性传给后端

[zhanyeye]

如下，一个Application包含多个AcItem。前端如何一次性将这一对多的关系提交？

public class Application {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;
    private int month;
    private int week;
    private int DC;
    private boolean isCheck;   // 是否已审核
    @Column(columnDefinition = "TIMESTAMP DEFAULT CURRENT_TIMESTAMP", updatable = false, insertable = false)
    private LocalDateTime insertTime;   //插入时间

    @ManyToOne
    private User applicant;    // 申请人
    @ManyToOne
    private User auditor;      // 审核人


    @OneToMany(mappedBy = "application")
    private List<AcItem> acItems;  //本次绩效申请包含的 AC申请
}

public class AcItem {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;
    private int AC;
    private String reason;

    @ManyToOne
    private Application application;  //ac申请属于的周绩效申请
}

[zhanyeye]

前端传来的application如下

{
  "applicant": {
    "id": 1
  },
  "auditor": {
    "id": 1
  },
  "month": 9,
  "week": 4,
  "dc": 2,
  "acItems": [
    {
      "ac": 1,
      "reason": "组会汇报"
    },
    {
      "ac": 1,
      "reason": "论文评审"
    },
    {
      "ac": 1,
      "reason": "组会评审"
    }
  ]
}

controller处，将json反序列化为application对象，json中的acItems也被反序列化为List<AcItem>,但是并不能被持久化！
https://github.com/zhanyeye/dingtalk-springboot/blob/df23baf3fb9d74bffb0555e87f046248bd35c8cc/src/main/java/com/softeng/dingtalk/controller/ApplicationController.java#L47-L54
需要自行插入application,并持久化
https://github.com/zhanyeye/dingtalk-springboot/blob/df23baf3fb9d74bffb0555e87f046248bd35c8cc/src/main/java/com/softeng/dingtalk/service/AcItemService.java#L25-L36