在子级和父级JSON Spring Boot中插入

Question

我的春季启动App数据表中有3个实体，分别是Appusers，Teacher和Student

1. Appusers

   @Id
   @GeneratedValue(strategy = GenerationType.AUTO) 
   @Column(name= "appuserId", updatable=false)
   private Long appuserId;     
   @Column(name = "username")
   private String username;
   
   @Column(name = "fullname")
   private String fullName;
   
   @Column(name = "email")
   private String email;   
   
   @Column(name = "password")
   private String password;
   
   @OneToOne(mappedBy = "appuser")
   private Teacher teacher;
   
   @OneToOne(mappedBy = "appuser")
   private Student student;
   

2. 老师

   @Id
   @GeneratedValue(strategy=GenerationType.AUTO)
   @Column(name = "teacherId" , updatable = false)
   private Long teacherId;
   
   @Column(name= "firstname")
   private String firstName;
   
   @Column(name = "lastname")
   private String lastName;
   
   @Column(name="designation")
   private String designation;
   
   @OneToOne(cascade = CascadeType.ALL)
   @JoinColumn(name = "appuserId", nullable = true)
   private Appuser appuser;
   
   @OneToMany(cascade = CascadeType.ALL, orphanRemoval=true ,mappedBy="teacher")
   @JsonIgnore
   private List<Course> courses;
   

3. 学生

   @Id
   @GeneratedValue(strategy = GenerationType.AUTO) 
   @Column(name= "studentId", updatable=false)
   private Long studentId;
   
   @Column(name = "firstName")
   private String firstName;
   
   @Column(name = "lastName")
   private String lastName;
   
   @Column(name = "enrolledSince")
   private String enrolledSince;
   
   @OneToOne(cascade = CascadeType.ALL)
   @JoinColumn(name = "appuserId", nullable = false)
   private Appuser appuser;
   
   @OneToMany(cascade = CascadeType.ALL,orphanRemoval=true, mappedBy="student")
   @JsonIgnore
   private List<CourseStudent> courseStudents;
   

我可以在邮递员中使用json格式插入appusers表中，并且运行良好。但是，当我尝试插入教师或学生表时，appusers中的结果为null。它不应为null，因为老师和学生对应用程序用户的外键。

Answer 1

这不应该发生。保存老师或学生时，应指定数据库中已经存在的appuser。并使用appuserId代替Appuser，这足以确定它属于哪个appuser。