如何在NestJS中插入具有OneToMany关系的实体？

// parent.entity.ts
import { Entity, PrimaryGeneratedColumn, Column, OneToMany } from 'typeorm';
import { Child } from './child.entity';

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

  @Column()
  name: string;

  @OneToMany(() => Child, child => child.parent)
  children: Child[];
}

// child.entity.ts
import { Entity, PrimaryGeneratedColumn, Column, ManyToOne } from 'typeorm';
import { Parent } from './parent.entity';

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

  @Column()
  name: string;

  @ManyToOne(() => Parent, parent => parent.children)
  parent: Parent;
}

// parent.service.ts
import { Injectable } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { Repository } from 'typeorm';
import { Parent } from './parent.entity';

@Injectable()
export class ParentService {
  constructor(
    @InjectRepository(Parent)
    private parentRepository: Repository<Parent>,
  ) {}

  async createParent(name: string) {
    const parent = this.parentRepository.create({ name });
    return this.parentRepository.save(parent);
  }
}

// parent.controller.ts
import { Controller, Post, Body } from '@nestjs/common';
import { ParentService } from './parent.service';

@Controller('parents')
export class ParentController {
  constructor(private parentService: ParentService) {}

  @Post()
  async createParent(@Body('name') name: string) {
    return this.parentService.createParent(name);
  }
}

// parent.module.ts
import { Module } from '@nestjs/common';
import { TypeOrmModule } from '@nestjs/typeorm';
import { Parent } from './parent.entity';
import { ParentController } from './parent.controller';
import { ParentService } from './parent.service';

@Module({
  imports: [TypeOrmModule.forFeature([Parent])],
  controllers: [ParentController],
  providers: [ParentService],
})
export class ParentModule {}

// app.module.ts
import { Module } from '@nestjs/common';
import { TypeOrmModule } from '@nestjs/typeorm';
import { ParentModule } from './parent/parent.module';

@Module({
  imports: [
    TypeOrmModule.forRoot({
      // TypeORM配置
    }),
    ParentModule,
  ],
})
export class AppModule {}