service-center/app/service/class.js

'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 ClassService extends CrudService {
  constructor(ctx) {
    super(ctx, 'class');
    this.model = this.ctx.model.Class;
    this.stumodel = this.ctx.model.Student;
    this.lessmodel = this.ctx.model.Lesson;
    this.umodel = this.ctx.model.User;
    this.tmodel = this.ctx.model.Trainplan;
    this.gmodel = this.ctx.model.Group;
    this.heamodel = this.ctx.model.Headteacher;
    this.teamodel = this.ctx.model.Teacher;
    this.locamodel = this.ctx.model.Location;
  }

  async divide(data) {
    // 21-04-27重做
    const { planid, termid } = data;
    assert(planid, '计划id为必填项');
    assert(termid, '期id为必填项');
    // 先自动生成班级 TODO:之后放开
    await this.autoclass(planid, termid);
    // 根据计划id与期id查询所有批次下的班级
    const newclass = await this.model.find({ planid, termid });
    if (!newclass) {
      throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '班级信息不存在');
    }
    // 根据计划和期查询所有上报的学生 并按照学校排序
    const newstudent = await this.stumodel.find({ termid }).sort({ schid: 1 });
    if (!newstudent) {
      throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '学生信息不存在');
    }
    // 按批次分组,每个批次处理自己的
    const claGroup = _.groupBy(newclass, 'batchid');
    const keys = Object.keys(claGroup);
    const result = {}; // key:班级id;value:学生id数组
    const pList = []; // 补人结果
    // 循环批次
    for (const bkey of keys) {
      const classList = claGroup[bkey]; // 该批次下的班级列表
      const batchStudentList = _.shuffle(newstudent.filter(f => f.batchid === bkey)); // shuffle:打乱顺序 该批次下的学生列表
      // 分为多个学校 男/女 数组
      // 按学校分组
      const sgroup = _.groupBy(batchStudentList, 'schid');
      // 学校代码key
      const schKeys = Object.keys(sgroup);
      let solve = {};
      const studentGroup = {}; // key:学校id-boy/girl;value:对应学校,性别的学生列表
      const classnum = classList.length; // 班级数
      const minClass = _.minBy(classList, i => parseInt(i.number)); // 该批次人数最少的班级
      let minNumber = 0;
      if (minClass) minNumber = parseInt(minClass.number);
      for (const skey of schKeys) {
        const schstus = sgroup[skey];
        // 获得每个学校的男/女人数
        const boys = schstus.filter(f => f.gender.includes('男'));
        const girls = schstus.filter(f => f.gender.includes('女'));
        studentGroup[`${skey}-boy`] = boys;
        studentGroup[`${skey}-girl`] = girls;
        // 算出平均分配解:每个 学校 固定向 每个班 派多少 男/女生
        // 需要验证最少的班级人数:因为平均后,可能造成人多了,要吐出来的
        const br = this.numDivide(boys.length, classnum);
        const gr = this.numDivide(girls.length, classnum);
        // 存入最佳计算结果,但是需要验证,看看这批次的计算结果是否<=班级最少人数;多了可是要吐人的.吐人的写法代码更多
        solve[`${skey}-boy`] = br;
        solve[`${skey}-girl`] = gr;

      }
      // 验证最佳结果是否超出班级的最少人数,不是,则处理
      solve = this.checkSolve(solve, minNumber, classnum);
      console.log(solve);
      // 塞人
      for (const c of classList) {
        const { _id } = c;
        if (!(result[_id] && _.isArray(result[_id]))) result[_id] = [];
        for (const key in solve) {
          const { res } = solve[key];
          let sList = studentGroup[key];
          // 取出指定人数
          const inputs = _.take(sList, res);
          // 放进结果里
          // .map(i => i._id)
          result[_id].push(...inputs);
          // 删除指定人数
          sList = _.drop(sList, res);
          // 赋值回去
          studentGroup[key] = sList;
        }
      }
      // 补人
      for (const c of classList) {
        const { _id, number, name } = c;
        let nowNum = result[_id].length;
        const soldup = _.cloneDeep(solve);
        while (nowNum < number) {
        // 补人,根据solve,获取补人的选择列表
          const res = this.getSelects(soldup);
          for (const r of res) {
            const { schid, gender } = r;
            // 获取学生列表
            const sList = studentGroup[`${schid}-${gender}`];
            const head = _.head(sList);
            if (head) {
              // 有学生,往班级里推,备选中删除,重新计算当前分配的班级人数,修改solve副本
              // result[_id].push(head._id);
              result[_id].push(head);
              studentGroup[`${schid}-${gender}`] = _.drop(sList);
              nowNum = result[_id].length;
              soldup[`${schid}-${gender}`].res++;
              pList.push(`${name}班用${schid}-${gender}补人:当前人数为${nowNum};要求${number}`);
              break;
            } else continue;
          }
        }

      }
    }
    // console.log(pList);
    // for (const key in result) {
    //   console.group(key);
    //   const list = result[key];
    //   const b = list.filter(f => f.gender === '男');
    //   const g = list.filter(f => f.gender === '女');
    //   console.log(b.length, g.length);
    //   console.groupEnd();
    // }

    // 更新学生的班级
    const ckeys = Object.keys(result);
    for (const classid of ckeys) {
      await this.stumodel.updateMany({ _id: result[classid] }, { classid });
    }
    // 新添,给学生排序号
    const claList = await this.model.find({ termid });
    for (const cla of claList) {
      await this.ctx.service.student.arrangeNumber({ classid: cla._id });
    }
  }
  /**
   * 算整除和取余
   * @param {Any} num1 性别人数
   * @param {Any} num2 班级人数
   * @property {Number} res 整除结果
   * @property {Number} el 余数
   */
  numDivide(num1, num2) {
    num1 = _.isNaN(parseInt(num1)) ? 0 : parseInt(num1);
    num2 = _.isNaN(parseInt(num2)) ? 0 : parseInt(num2);
    const res = _.floor(num1 / num2, 0);
    const el = num1 % num2;
    return { res, el };
  }
  /**
   * 验证计算结果是否 不超过 最少人数班级的人数
   * @param {Object} solve 计算结果:key:${schid}-${gender}
   * @param {Number} number 最少人数班级的人数
   * @param {Number} classnum 班级数量,如果需要减人数的话,是要将每班的人数减1,-1就意味着要 - 班级数 *1;余数+班级数*1
   */
  checkSolve(solve, number, classnum) {
    let countClassNum = 0;
    let ns = [];
    for (const key in solve) {
      const { res = 0, el = 0 } = _.get(solve, key, {});
      countClassNum += res;
      ns.push({ res, el, key });
    }
    if (countClassNum <= number) return solve;
    do {
      ns = _.orderBy(ns, [ 'res' ], [ 'desc' ]);
      const head = _.head(ns);
      head.res--;
      head.el += classnum;
      ns[0] = head;
      countClassNum = ns.reduce((p, n) => p + n.res, 0);
    } while (countClassNum > number);
    for (const i of ns) {
      const { key, ...others } = i;
      solve[key] = { ...others };
    }
    return solve;
  }
  // 获取选择结果
  getSelects(solve) {
    // 做出补人选项的集合:按学校人数,性别人数来看
    const keys = Object.keys(solve);
    let schids = keys.map(i => {
      const arr = i.split('-');
      let res;
      if (arr[0] && parseInt(arr[0])) res = arr[0];
      return res;
    });
    schids = _.compact(_.uniq(schids));
    let genders = keys.map(i => {
      const arr = i.split('-');
      return arr[1];
    });
    genders = _.compact(_.uniq(genders));
    let schArr = [];
    for (const schid of schids) {
      const midKeys = keys.filter(f => f.includes(schid));
      let count = 0;
      for (const k of midKeys) {
        count += solve[k].res;
      }
      const obj = { schid, count };
      schArr.push(obj);
    }
    let genArr = [];
    for (const gen of genders) {
      const midKeys = keys.filter(f => f.includes(gen));
      let count = 0;
      for (const k of midKeys) {
        count += solve[k].res;
      }
      const obj = { gender: gen, count };
      genArr.push(obj);
    }
    // 2个数组升序排序
    schArr = _.orderBy(schArr, [ 'count' ], [ 'asc' ]);
    genArr = _.orderBy(genArr, [ 'count' ], [ 'asc' ]);
    const arr = [];
    // 优先性别
    // for (const gen of genArr) {
    //   for (const sch of schArr) {
    //     const { schid } = sch;
    //     const { gender } = gen;
    //     arr.push({ schid, gender });
    //   }
    // }
    // 优先学校
    for (const sch of schArr) {
      for (const gen of genArr) {
        const { schid } = sch;
        const { gender } = gen;
        arr.push({ schid, gender });
      }
    }
    return arr;
  }

  // 取得同样类型的学生
  async getstutype(_students, type) {
    const data = [];
    for (const stuid of _students) {
      const student = await this.stumodel.findById(stuid);
      if (student && student.type === type) {
        data.push(stuid);
      }
    }
    return data;
  }

  // 自动生成班级私有方法
  async autoclass(planid, termid) {
    // 删除所有计划下的班级
    await this.model.deleteMany({ planid, termid });
    // 根据批次id取得当前批次具体信息
    const res = await this.tmodel.findById(planid);
    if (!res) {
      throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '全年计划信息不存在');
    }
    // 循环出所有班级进行添加操作
    const term = await res.termnum.id(termid);
    for (const batch of term.batchnum) {
      const classs = await batch.class;
      for (const cla of classs) {
        const newdata = { name: cla.name, number: cla.number, batchid: batch.id, termid: term.id, planid: res.id, type: cla.type };
        const rescla = await this.model.create(newdata);
        await this.toSetClassSetting({ classid: rescla._id });
      }
    }
  }

  // 根据传入的学生列表和班级id更新学生信息
  async studentup(classid, batchid, beforestu) {
    // 循环学生id
    for (const stuid of beforestu) {
      const student = await this.stumodel.findById(stuid);
      if (student) {
        student.classid = classid;
        student.batchid = batchid;
        await student.save();
      }
    }
  }

  // 自动分组
  async groupcreate(termid, batchid, classid) {
    const group = await this.gmodel.find({ termid, batchid, classid });
    if (group.length === 0) {
      for (let i = 1; i < 8; i++) {
        const name = i + '组';
        const newdata = { name, termid, batchid, classid };
        await this.gmodel.create(newdata);
      }
    }
  }

  // 根据传入的学生列表和班级id更新学生信息
  async studentupclass({ id }, data) {
    assert(id, '班级id为必填项');
    // 根据全年计划表id查出对应的全年计划详细信息
    const trainplan = await this.tmodel.findOne({ 'termnum.batchnum.class._id': ObjectId(id) });
    if (!trainplan) {
      throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '全年计划信息不存在');
    }
    // 取得计划期批次信息
    let termid = '';
    let batchid = '';
    let classname = '';
    let class_ = {};
    for (const term of trainplan.termnum) {
      for (const batch of term.batchnum) {
        const _class = await batch.class.id(id);
        if (_class) {
          termid = term.id;
          batchid = batch.id;
          classname = _class.name;
          class_ = _class;
          break;
        }
      }
    }
    if (!class_) {
      throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '班级信息不存在');
    }
    let classid_ = '';
    if (classname) {
      const cla_ = await this.model.findOne({ termid, batchid, name: classname });
      if (cla_) {
        classid_ = cla_.id;
      } else {
        const newdata = {
          name: class_.name,
          number: class_.number,
          batchid,
          termid,
          planid: trainplan.id,
          type: class_.type,
          headteacherid: class_.headteacherid,
        };
        const rescla = await this.model.create(newdata);
        if (rescla) {
          classid_ = rescla.id;
        }
      }
    }
    if (classid_) {
      // 循环学生id
      for (const stuid of data) {
        const student = await this.stumodel.findById(stuid);
        if (student) {
          student.classid = classid_;
          await student.save();
        }
      }
    }
    // 添加,给学生排序号
    await this.ctx.service.student.arrangeNumber({ classid: classid_ });
    // TODO 根据模板复制班级信息
    await this.toSetClassSetting({ classid: classid_ });

  }

  async notice(data) {
    for (const classid of data.classids) {
      // 根据班级id找到需要通知的班级
      const _class = await this.model.findById(classid);
      const { headteacherid } = _class;
      // 根据班级id找到对应的课程表
      const lesson = await this.lessmodel.findOne({ classid });
      if (lesson) {
        const lessons = lesson.lessons;
        const remark = '感谢您的使用';
        const date = await this.ctx.service.util.updatedate();
        const detail = '班级各项信息已确认，请注意查收';
        // 遍历班级授课教师发送通知
        for (const lessoninfo of lessons) {
          const teaid = lessoninfo.teaid;
          const _teacher = await this.umodel.findOne({ uid: teaid, type: '3' });
          if (_teacher) {
            const teaopenid = _teacher.openid;
            this.ctx.service.weixin.sendTemplateMsg(this.ctx.app.config.REVIEW_TEMPLATE_ID, teaopenid, '您有一个新的通知', detail, date, remark, classid);
          }
        }
        // 给班主任发送通知
        const _headteacher = await this.umodel.findOne({ uid: headteacherid, type: '1' });
        if (_headteacher) {
          const headteaopenid = _headteacher.openid;
          this.ctx.service.weixin.sendTemplateMsg(this.ctx.app.config.REVIEW_TEMPLATE_ID, headteaopenid, '您有一个新的通知', detail, date, remark, classid);
        }

        // 根据班级的期id查询对应的培训计划
        const trainplan = await this.tmodel.findOne({ 'termnum._id': _class.termid });
        const term = await trainplan.termnum.id(_class.termid);
        const batch = await term.batchnum.id(_class.batchid);
        const startdate = batch.startdate;
        const classname = _class.name;
        // 给班级所有学生发送邮件通知
        const students = await this.stumodel.find({ classid });
        for (const student of students) {
          const { email, name } = student;
          const subject = '吉林省高等学校毕业生就业指导中心通知';
          const text = name + '您好！\n欢迎参加由吉林省高等学校毕业生就业指导中心举办的“双困生培训会”。\n您所在的班级为：' + classname + '\n班级开课时间为：' + startdate;
          this.ctx.service.util.sendMail(email, subject, text);
        }
      }
    }
  }

  async uptea(data) {
    for (const _data of data) {
      const classInfo = await this.model.findById(_data.id);
      classInfo.headteacherid = _data.headteacherid;
      await classInfo.save();
    }
  }

  async query({ skip, limit, ...info }) {
    const classes = await this.model
      .find(info)
      .populate([
        {
          path: 'yclocationid',
          model: 'Location',
          select: 'name',
        },
        {
          path: 'kzjhlocationid',
          model: 'Location',
          select: 'name',
        },
        {
          path: 'kbyslocationid',
          model: 'Location',
          select: 'name',
        },
        {
          path: 'jslocationid',
          model: 'Location',
          select: 'name',
        },
        {
          path: 'headteacherid',
          model: 'Headteacher',
          select: 'name',
        },
      ])
      .skip(Number(skip))
      .limit(Number(limit));
    const data = [];
    let planids = classes.map(i => i.planid);
    planids = _.uniq(planids);
    const trainplan = await this.tmodel.find({ _id: { $in: planids } });
    for (const _class of classes) {
      let res = await this.setClassData(_class, trainplan);
      if (res) {
        res = this.setData(res);
        data.push(res);
      } else {
        data.push(_class);
      }
    }
    return data;

  }

  async fetch({ id }) {
    let classInfo = await this.model.findById(id).populate([
      {
        path: 'yclocationid',
        model: 'Location',
        select: 'name',
      },
      {
        path: 'kzjhlocationid',
        model: 'Location',
        select: 'name',
      },
      {
        path: 'kbyslocationid',
        model: 'Location',
        select: 'name',
      },
      {
        path: 'jslocationid',
        model: 'Location',
        select: 'name',
      },
      {
        path: 'headteacherid',
        model: 'Headteacher',
        select: 'name',
      },
    ]);
    const trainplan = await this.tmodel.findById(classInfo.planid);
    classInfo = await this.setClassData(classInfo, [ trainplan ]);
    classInfo = this.setData(classInfo);
    return classInfo;
  }
  // 整理数据,找礼仪教师
  async setClassData(cla, trainplan) {
    const { planid, termid, batchid } = cla;
    cla = JSON.parse(JSON.stringify(cla));
    const tpRes = trainplan.find(f => ObjectId(planid).equals(f._id));
    if (!tpRes) throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '未找到班级的计划信息');
    const t = tpRes.termnum.id(termid);
    if (!t) throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '未找到班级的期信息');
    const { term, batchnum } = t;
    if (!term) throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '未找到班级的期信息');
    else cla.term = term;
    if (!batchnum) throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '未找到班级的批次信息');
    const b = batchnum.id(batchid);
    if (!b) throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '未找到班级的批次信息');
    const { batch, startdate, enddate } = b;
    if (batch)cla.batch = batch;
    if (startdate) cla.startdate = startdate;
    if (enddate) cla.enddate = enddate;
    // 礼仪教师
    if (cla.lyteacherid) {
      let res = await this.teamodel.findById(cla.lyteacherid);
      if (!res) res = await this.heamodel.findById(cla.lyteacherid);
      if (res) cla.lyteacher = res.name;
    }
    return cla;
  }

  // 整理数据
  setData(cla) {
    const { headteacherid, yclocationid, kzjhlocationid, kbyslocationid, jslocationid } = cla;
    const arr = [];
    if (headteacherid && _.isObject(headteacherid)) arr.push({ headteacherid });
    if (yclocationid && _.isObject(yclocationid)) arr.push({ yclocationid });
    if (kzjhlocationid && _.isObject(kzjhlocationid)) arr.push({ kzjhlocationid });
    if (kbyslocationid && _.isObject(kbyslocationid)) arr.push({ kbyslocationid });
    if (jslocationid && _.isObject(jslocationid)) arr.push({ jslocationid });
    for (const kid of arr) {
      for (const key in kid) {
        if (kid.hasOwnProperty(key)) {
          const obj = kid[key];
          const { _id, name } = obj;
          const keynoids = key.split('id');
          cla[key] = _id;
          cla[_.get(keynoids, 0)] = name;
        }
      }
    }
    return cla;
  }


  async upclasses(data) {
    for (const _data of data) {
      await this.model.findByIdAndUpdate(_data.id, _data);
    }
  }

  async classinfo({ id: classid }) {
    const _classes = await this.model.findById(classid);
    // 班级信息
    const classes = _.cloneDeep(JSON.parse(JSON.stringify(_classes)));
    // 学生信息
    const students = await this.stumodel.find({ classid });
    // 所有用户信息
    const users = await this.umodel.find();
    if (students) {
      for (const stu of students) {
        const user = users.find(item => item.uid === stu.id);
        if (user && user.openid) {
          const _stu = _.cloneDeep(JSON.parse(JSON.stringify(stu)));
          _stu.hasuserinfo = '1';
          _.remove(students, stu);
          students.push(_stu);
        }
      }
      classes.students = students;
    }
    // 班主任信息
    let headteacher;
    if (classes.headteacherid) {
      headteacher = await this.heamodel.findById(classes.headteacherid);
    }
    // 礼仪课老师信息
    let lyteacher;
    if (classes.lyteacherid) {
      lyteacher = await this.heamodel.findById(classes.lyteacherid);
      if (!lyteacher) {
        lyteacher = await this.teamodel.findById(classes.lyteacherid);
      }
    }
    // 教课老师信息
    let teachers = [];
    const lessones = await this.lessmodel.findOne({ classid });
    if (lessones) {
      for (const lesson of lessones.lessons) {
        if (lesson.teaid) {
          const teacher = await this.teamodel.findById(lesson.teaid);
          teachers.push(teacher);
        }
      }
    }
    teachers.push(lyteacher);
    teachers.push(headteacher);
    teachers = _.uniq(_.compact(teachers));
    for (const tea of teachers) {
      const user = users.find(item => item.uid === tea.id);
      if (user && user.openid) {
        const _tea = _.cloneDeep(JSON.parse(JSON.stringify(tea)));
        _tea.hasuserinfo = '1';
        _.remove(teachers, tea);
        teachers.push(_tea);
      }
    }
    classes.teachers = teachers;
    return classes;
  }
  // 根据模板设置班级信息
  async toSetClassSetting({ classid }) {
    const setting = await this.ctx.model.Setting.findOne();
    if (!setting) throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '未找到系统设置');
    const { template_term } = setting;
    if (!template_term) throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '未找到班级模板设置');
    const templateList = await this.query({ termid: template_term });
    const tClass = await this.model.findById(classid);
    if (!tClass) throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '班级不存在,无法复制设定的班级设置');
    const { name, termid, batchid } = tClass;
    const r = templateList.find(f => f.name === name);
    // 找到班主任全年计划
    const trainPlan = await this.tmodel.findById(tClass.planid);
    if (!trainPlan) throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '未找到该班所在的年度计划信息');
    const tpt = trainPlan.termnum.id(tClass.termid);
    if (!tpt) throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '未找到该班所在年度计划的期信息');
    const tpb = tpt.batchnum.id(tClass.batchid);
    if (!tpb) throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '未找到该班所在年度计划的批次信息');
    if (!tpb.class) throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '未找到该班所在年度计划批次下的班级');
    const tpc = tpb.class.find(f => f.name === tClass.name);
    if (!tpc) throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '未找到该班所在年度计划的班级信息');
    const { headteacherid } = tpc;
    if (r) {
      // 说明这个是正常班,且从模板中找得到; 除了礼仪教师外,都复制过来
      const { jslocationid, kbyslocationid, kzjhlocationid, yclocationid } = r;
      if (!tClass.jslocation && jslocationid) tClass.jslocationid = jslocationid;
      if (!tClass.kbyslocationid && kbyslocationid) tClass.kbyslocationid = kbyslocationid;
      if (!tClass.kzjhlocationid && kzjhlocationid) tClass.kzjhlocationid = kzjhlocationid;
      if (!tClass.yclocationid && yclocationid) tClass.yclocationid = yclocationid;
      if (!tClass.headteacherid && headteacherid) {
        tClass.headteacherid = headteacherid;
        // 默认班主任为礼仪教师
        tClass.lyteacherid = headteacherid;
      }
      await tClass.save();
    } else {
      // 没找到,有可能是普通班,也有可能是非普通班
      // 找这个班级的同批次
      const tClassBatch = await this.query({ termid, batchid });
      const r = tClassBatch.find(f => ObjectId(tClass._id).equals(f._id));
      const ri = tClassBatch.findIndex(f => ObjectId(tClass._id).equals(f._id));
      // TODO 特殊班需要判断,如果没有就没有
      // if (r) throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '无法确定班级批次排序');
      if (!r) {
        const { batch: tAllClassBatch } = r;
        const templateBatchList = templateList.filter(f => f.batch === tAllClassBatch);
        // 根据该班级所在批次的顺序,找到对应模板,然后复制
        const copyTemplate = templateBatchList[ri];
        const { jslocationid, kbyslocationid, kzjhlocationid, yclocationid } = copyTemplate;
        if (!tClass.jslocation && jslocationid) tClass.jslocationid = jslocationid;
        if (!tClass.kbyslocationid && kbyslocationid) tClass.kbyslocationid = kbyslocationid;
        if (!tClass.kzjhlocationid && kzjhlocationid) tClass.kzjhlocationid = kzjhlocationid;
        if (!tClass.yclocationid && yclocationid) tClass.yclocationid = yclocationid;
        if (!tClass.headteacherid && headteacherid) tClass.headteacherid = headteacherid;
        await tClass.save();
      }
    }
  }
}

module.exports = ClassService;