'use strict';


const assert = require('assert');
const _ = require('lodash');
const { ObjectId } = require('mongoose').Types;
const { CrudService } = require('naf-framework-mongoose/lib/service');
const { BusinessError, ErrorCode } = require('naf-core').Error;

class ChatroomService extends CrudService {
  constructor(ctx) {
    super(ctx, 'chatroom');
    this.model = this.ctx.model.Chatroom;
  }

  async create({ teacherid, teacher, studentid, student }) {
    assert(teacherid, '缺少教师id');
    assert(teacher, '缺少教师姓名');
    assert(studentid, '缺少学生id');
    assert(student, '缺少学生姓名');
    const res = await this.model.findOne({ teacherid, teacher, studentid, student });
    if (res) return res;
    const cres = await this.model.create({ teacherid, teacher, studentid, student });
    return cres;
  }

}

module.exports = ChatroomService;