无法弄清楚为什么它的"查找不是一个函数"我是Nodejs和Mongodb的新手。想使用ejs显示数据库文档请帮助我。我检查了到DB的连接，它是确定的。我还阅读了一些其他问题，但任何适合我的问题的答案。它显示类型错误：clgModel.find不是函数

• • 索引. js**

var express = require('express');
    var clgModel = require('../modules/engg_clg');
    var router = express.Router();
    var college = clgModel.find({});
    
    
    /* GET home page. */
    router.get('/', function(req, res, next) {
      college.exec(function(err, data) {
    
        if (err) throw err;
        res.render('index', {
          title: 'Engineering College Rank',
          records: data
        });
      });
    
    });
    
    module.exports = router;

**

• • 工程js**
    **

var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/Engg_clg_rnk', {
  useNewUrlParser: true
});
var conn = mongoose.connection;

var collegeSchema = new mongoose.Schema({

  id: Number,
  City: String,
  Institute_ID: String,
  Name: String,
  Rank: Number,
  Score: Number,
  State: String`enter code here`

});

var collegeModel = mongoose.model('Employee', collegeSchema);
module.export = collegeModel;

• • 一月一日**

以表格形式

<thead>
    <tr>
      <th scope="col">City</th>
      <th scope="col">Institute_ID</th>
      <th scope="col">Name</th>
      <th scope="col">Rank</th>
      <th scope="col">Score</th>
      <th scope="col">State</th>
    </tr>
  </thead>
  <% records.forEach(function(row){%>
  <tr>

    <td><%= row.City %></td>
    <td><%= row.Institute_ID %></td>
    <td><%= row.Name %></td>
    <td><%= row.Rank %></td>
    <td><%= row.Score %></td>
    <td><%= row.State %></td>


  </tr>

  <% }) %>
</table>

显示数据库文档