在Loopback 4中设置多对多关系

import {Entity, model, property, hasMany, belongsTo} from '@loopback/repository';

@model()
export class Student extends Entity {
  @property({
    type: 'string',
    id: true,
    generated: true,
  })
  id?: string;

  @property({
    type: 'string',
    required: true,
  })
  name: string;

  @hasMany(() => StudentCourse, {keyTo: 'studentId'})
  courses?: StudentCourse[];
}

@model()
export class Course extends Entity {
  @property({
    type: 'string',
    id: true,
    generated: true,
  })
  id?: string;

  @property({
    type: 'string',
    required: true,
  })
  title: string;

  @hasMany(() => StudentCourse, {keyTo: 'courseId'})
  students?: StudentCourse[];
}

@model()
export class StudentCourse extends Entity {
  @belongsTo(() => Student, {keyTo: 'studentId'})
  studentId: string;

  @belongsTo(() => Course, {keyTo: 'courseId'})
  courseId: string;
}