我正在NodeJs应用程序它的博客应用程序工作。我试图将文章保存在数据库中，我提交表单后得到这个错误：

TypeError: Post is not a constructor

索引.html

<form action="/admin/posts/create" method="post">

  <div class="form-group">
    <label for="title">Title</label>
    <input type="text" class="form-control" name="title" id="title" placeholder="Enter The Title">
  </div>

  <div class="form-group">
    <label for="status">Status</label>
    <select name="status" id="status" class="form-control">
      <option value="public">Public</option>
      <option value="private">Private</option>
      <option value="draft">Draft</option>
    </select>
  </div>

  <div class="form-group">
    <label for="description">Content</label>
    <textarea name="description" id="description" class="form-control" placeholder="Enter your content here" rows="5"></textarea>
  </div>

  <button class="btn btn-outline-success btn-lg" type="submit">Create Post</button>

</form>

这里是控制器部分

管理控制器.js

const Post = require('../models/postModel').Post;

module.exports = {
    index: (req, res) => {
        res.render('admin/index');
    },

    getPosts: (req, res) => {
        res.render('admin/posts/index');
    },

    submitPosts: (req, res) => {
        const newPost = new Post({
            title: req.body.title,
            description: req.body.description,
            status: req.body.status   
        });

        newPost.save().then(post => {
            req.flash('success-message', 'Post created successfully.');
            res.redirect('/admin/posts');
        });

    },

    createPosts: (req, res) => {
        res.render('admin/posts/create');
    }
};

我不知道为什么我得到这个错误作为导入模型

const Post = require('../models/postModel').Post;

任何帮助都将不胜感激。