localhost_oa_based/src/helper/crud/base.service.ts

import { NotFoundException } from '@nestjs/common';
import { ObjectLiteral, Repository } from 'typeorm';

import { PagerDto } from '~/common/dto/pager.dto';

import { paginate } from '../paginate';
import { Pagination } from '../paginate/pagination';

export class BaseService<E extends ObjectLiteral, R extends Repository<E> = Repository<E>> {
  constructor(private repository: R) {}

  async list({ page, pageSize }: PagerDto): Promise<Pagination<E>> {
    return paginate(this.repository, { page, pageSize });
  }

  async findOne(id: number): Promise<E> {
    const item = await this.repository.createQueryBuilder().where({ id }).getOne();
    if (!item) throw new NotFoundException('未找到该记录');

    return item;
  }

  async create(dto: any): Promise<E> {
    return await this.repository.save(dto);
  }

  async update(id: number, dto: any): Promise<void> {
    await this.repository.update(id, dto);
  }

  async delete(id: number): Promise<void> {
    const item = await this.findOne(id);
    await this.repository.remove(item);
  }
}