server-v2/app/service/relation/relationStudentSchool.js

'use strict';
const { CrudService } = require('naf-framework-mongoose-free/lib/service');
const { BusinessError, ErrorCode } = require('naf-core').Error;
const _ = require('lodash');
const assert = require('assert');
const Transaction = require('mongoose-transactions');

//
class RelationStudentSchoolService extends CrudService {
  constructor(ctx) {
    super(ctx, 'relationstudentschool');
    this.model = this.ctx.model.Relation.RelationStudentSchool;
    this.studentModel = this.ctx.model.User.Student;
    this.tran = new Transaction();
  }
  // 创建关系前,先查下有没有,有就别创建了
  async beforeCreate(data) {
    const { student_id, school_id } = data;
    const num = await this.model.count({ student_id, school_id });
    if (num <= 0) {
      return data;
    }
    throw new BusinessError(ErrorCode.DATA_EXISTED, '学员已入学,无需重复添加');
  }

  // 删除关系,同时将用户变为不同用户
  async delete(filter) {
    assert(filter);
    filter = await this.beforeDelete(filter);
    const { _id, id } = filter;
    try {
      const data = await this.model.findById(_id || id);
      if (!data) throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '未找到要删除的数据');
      const { student_id } = data;
      const student = await this.studentModel.findById(student_id);
      const { user_id } = student;
      this.tran.remove('RelationStudentSchool', _id || id);
      this.tran.remove('Student', student_id);
      this.tran.update('User', user_id, { type: '0' });
      await this.tran.run();
    } catch (error) {
      await this.tran.rollback();
      throw new Error(error);
    } finally {
      this.tran.clean();
    }
    return 'deleted';
  }
}

module.exports = RelationStudentSchoolService;