在nestjs中保存多对多

// user.entity.ts
import { Entity, Column, PrimaryGeneratedColumn, ManyToMany, JoinTable } from 'typeorm';
import { Role } from './role.entity';

@Entity()
export class User {
  @PrimaryGeneratedColumn()
  id: number;

  @Column()
  name: string;

  @ManyToMany(() => Role)
  @JoinTable()
  roles: Role[];
}

// role.entity.ts
import { Entity, Column, PrimaryGeneratedColumn, ManyToMany } from 'typeorm';
import { User } from './user.entity';

@Entity()
export class Role {
  @PrimaryGeneratedColumn()
  id: number;

  @Column()
  name: string;

  @ManyToMany(() => User, user => user.roles)
  users: User[];
}

const user = new User();
user.name = 'John';

const role = new Role();
role.name = 'Admin';

user.roles = [role];

await user.save();

const users = await userRepository
  .createQueryBuilder('user')
  .innerJoinAndSelect('user.roles', 'role')
  .where('role.name = :name', { name: 'Admin' })
  .getMany();