javascript - Node JS cannot find module error for file in another folder - Stack Overflow

admin管理员组

文章数量:1347931

If i have schema.js in the same folder as index.js doing something like

var schemas = require('./schema');

works fine, but if i put the schema.js in another folder and write

var schemas = require('./folder/schema');

i get an error Cannot find module whats happening?

Edit1 : I got rid of the error by using ..folder/schema instead of single. and the server runs but it still doesn't work properly as I cant use the mongoosedb object returned through module.export from ../model/schema in the index.js file. It says myModel.find is not a function. Whats going on??

controllers/findallusers.js

var myModel = require('../models/schema');

var alluser;

myModel.find({}, function(err, foundData){   
  if(err){
    console.log(err);
    res.status(500).send();
  }
  else{
        alluser = foundData;
      }

    console.log(alluser); <-- this log is defined
});

    console.log(alluser); <-- this log is undefined

    module.exports = alluser; <-- cant export anything

If i have schema.js in the same folder as index.js doing something like

var schemas = require('./schema');

works fine, but if i put the schema.js in another folder and write

var schemas = require('./folder/schema');

i get an error Cannot find module whats happening?

Edit1 : I got rid of the error by using ..folder/schema instead of single. and the server runs but it still doesn't work properly as I cant use the mongoosedb object returned through module.export from ../model/schema in the index.js file. It says myModel.find is not a function. Whats going on??

controllers/findallusers.js

var myModel = require('../models/schema');

var alluser;

myModel.find({}, function(err, foundData){   
  if(err){
    console.log(err);
    res.status(500).send();
  }
  else{
        alluser = foundData;
      }

    console.log(alluser); <-- this log is defined
});

    console.log(alluser); <-- this log is undefined

    module.exports = alluser; <-- cant export anything

• javascript
• node.js
• express

Share Improve this question Follow edited Sep 14, 2016 at 20:08 xtabbas asked Sep 14, 2016 at 17:20 xtabbasxtabbas 64744 gold badges1010 silver badges1818 bronze badges 5

• 1 Is the folder directory in the same directory as the index.js file? – arjabbar Commented Sep 14, 2016 at 17:22
• i mean i have a router folder with index.js and a model folder which has schema.js – xtabbas Commented Sep 14, 2016 at 17:26
• and im exporting the schema object using module.export in schema,js and trying to use it in index.js by var schemas = require('./model/schema'); – xtabbas Commented Sep 14, 2016 at 17:27
• It appears that .find() is asynchronous. Therefore IT IS IMPOSSIBLE to return it via module.exports. Instead, export a function that accept a callback or return a promise. – slebetman Commented Sep 15, 2016 at 3:23
• @slebetman I'm doing what pawan mentioned, exporting a function list : funtion(req, res){ } but getting syntax error at list: function(req, res) { whats going on? – xtabbas Commented Sep 15, 2016 at 4:45

Add a ment  | 

2 Answers 2

Sorted by: Reset to default 4

Resolve path to schema.js correctly

Assuming your project structure like this

Project
 |
 +-- routers
 |  |  
 |  +-- index.js    
 +-- models
 |  |  
 |  +-- schema.js


//in index.js 
var schemas = require('../models/schema');

To solve second error i.e myModel.find not a function use, module.exports instead of using module.export

module.exports = myModel;

Resolution to your 3rd Problem

// controllers/findallusers.js --> (keep name simple  i.e userController.js)
var myModel = require('../models/schema');

module.exports =  {

    /**
     * Get All Users
     */
    list: function(req, res) {
       myModel.find({},function(err, users){
          if(err) {
              return res.status(500).json({message: 'Error getting Users.'});
          }
         return res.json(users);
      });
    },
   /**
    * Keep Adding more functions as you want
   */

   create: function(req,res){
       //functionality to create user
   },

   delete: function(req,res){
      // functionality to delete user
   },

   someDummyName: function(callback) {
       myModel.find({},function(err, users){
          if(err) {
            return callback(err)
          }
         return callback(null,users);
      });
    }       

}

// Solution to your question https://stackoverflow./questions/39504219/how-to-use-use-callbacks-or-promises-to-return-a-object-from-an-asynchronous-fun

//index.js call this new method i.e someDummyName as  
router.get('/allusers', function(req, res){       

    userController.someDummyName(function(err,result){
      if(err) {
        //return err
      }
      //process result as per your need
    });

});

You are exporting a variable myModel from schema.js and importing just schema in index.js

So, try to reference the .find function using myModel.myModel.find() My guess is that the myModel variable is behind your existing myModel variable in index.js

本文标签： javascriptNode JS cannot find module error for file in another folderStack Overflow