'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 GroupService extends CrudService {
  constructor(ctx) {
    super(ctx, 'group');
    this.model = this.ctx.model.Group;
  }

  async insert(data) {
    const { groupid, studentid } = data;
    const group = await this.model.findById(groupid);
    if (group.studentid.includes(studentid)) {
      throw new BusinessError(ErrorCode.DATA_EXIST, '您已加入该组，请勿重复操作');
    } else {
      group.studentid.push(studentid);
      await group.save();
    }
  }

  async exit(data) {
    const { groupid, studentid } = data;
    const group = await this.model.findById(groupid);
    group.studentid.remove(studentid);
    await group.save();
  }

}

module.exports = GroupService;