How to get rid of Error: “OverwriteModelError: Cannot overwrite `undefined` model once compiled.”?

Question

I have a common method for updating document of any collection in MongoDB?

The following code is in file name Deleter.js

module.exports         


        

Answer 1

This is because require one Model in two paths.

// Comment Model file

var mongoose = require('mongoose')
var Schema = mongoose.Schema

var CommentSchema = Schema({
  text: String,
  author: String
})

module.exports = mongoose.model('Comment', CommentSchema)

// Seed file

const commentData = {
  user: "David Lee",
  text: "This is one comment"
}
var Comment = require('./models/Comment')

module.exports = function seedDB () {
  Comment.create(commentData, function (err, comment) {
    console.log(err, commemt)
  })
}

// index file

var Comment = require('./models/comment')
var seedDB = require('./seeds')
seedDB()
const comment = {
  text: 'This girl is pretty!',
  author: 'David'
}
Comment.create(, function (err, comment) {
    console.log(err, comment)
 })

Now you will get throw new mongoose.Error.OverwriteModelError(name), Cuz you require Comment model in two different ways. Seed file var Comment = require('./models/Comment')，Index file var Comment = require('./models/comment')