service-center/app/service/score.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 ScoreService extends CrudService {
  constructor(ctx) {
    super(ctx, 'score');
    this.model = this.ctx.model.Score;
    this.tmodel = this.ctx.model.Teacher;
  }

  async create(data) {
    const { teacherid, score } = data;
    const res = await this.model.create(data);
    this.computedScore({ teacherid });
    return res;
  }


  async update({ id, score }) {
    const r = await this.model.findById(id);
    if (r) {
      // 修改分数,重置状态,下面重新计算
      r.score = score;
      await r.save();
    }
    this.computedScore({ teacherid: r.teacherid });
  }

  // 根据教师id计算教师分数
  async computedScore({ teacherid }) {
    assert(teacherid, '没有教师信息,无法计算分数');
    const teacher = await this.tmodel.findById(teacherid);
    if (!teacher) throw new BusinessError(ErrorCode.DATA_NOT_EXIST, '没有找到教师信息');
    const { beforescore } = teacher;
    let teaScoreList = await this.model.find({ teacherid });
    // 判断有没有学生给评分
    if (teaScoreList.length <= 0) return;
    teaScoreList = teaScoreList.map(i => {
      i.score = i.score * 1;
      return i;
    });
    teaScoreList = _.uniqBy(teaScoreList, 'studentid');
    teaScoreList = _.orderBy(teaScoreList, [ 'score' ], [ 'desc' ]);
    teaScoreList = _.drop(teaScoreList);
    teaScoreList = _.dropRight(teaScoreList);
    const stuScoreTotal = teaScoreList.reduce((p, n) => p + (n.score * 1 || 0), 0);
    let score = 0;
    if (beforescore) {
      score = _.round(_.divide(beforescore * 1 + stuScoreTotal * 1, (teaScoreList.length || 0) + 1), 2);
    } else {
      score = _.round(_.divide(stuScoreTotal * 1, teaScoreList.length), 2);
    }
    teacher.xsscore = score;
    await teacher.save();

  }

}

module.exports = ScoreService;