Error "Cannot find module 'errors.server.controller.js'" while trying to extend default backend - mean-stack

Question

I want to add new code to my backend, which will put some data to MongoDB collection. I decided to do it in core.server.controller.js because my app will be really simple and I don't need to create a new module for this. So I opened /app/controllers/users/users.profile.server.controller.js, a mean.js built-in controller and copied
var _ = require('lodash'),
errorHandler = require('../errors.server.controller.js'),
mongoose = require('mongoose'),
passport = require('passport'),
User = mongoose.model('User');
to core.server.controller.js file to provide mongoose and the other stuff. Then I removed ../ from errorHandler require argument and changed mongoose model name to my own, which I've created before.
But when I want to start this app in console, I get an error:
Error: Cannot find module 'errors.server.controller.js'
at Function.Module._resolveFilename (module.js:336:15)
at Function.Module._load (module.js:278:25)
at Module.require (module.js:365:17)
at require (module.js:384:17)
at Object.<anonymous> (/Users/developer2/baca/app/controllers/core.server.controller.js:7:17)
at Module._compile (module.js:460:26)
at Object.Module._extensions..js (module.js:478:10)
at Module.load (module.js:355:32)
at Function.Module._load (module.js:310:12)
at Module.require (module.js:365:17)
at require (module.js:384:17)
at module.exports (/Users/developer2/baca/app/routes/core.server.routes.js:5:13)
at /Users/developer2/baca/config/express.js:118:35
at Array.forEach (native)
at module.exports (/Users/developer2/baca/config/express.js:117:49)
at Object.<anonymous> (/Users/developer2/baca/server.js:24:38)
So how can I fix this?

Answer 1

You are requiring errors.server.controller.js however the path is wrong.
You can either use the file path relative to your app root directory or to the file (core.server.controller.js) from where you're requiring:
Solution 1: Path relative to the app root directory (preferred for the sake of consistency since MEAN.js uses path for requires in other js files):
You can use node path module to help you with this like so:
var path = require('path),
errorHandler = require(path.resolve('./modules/core/server/controllers/errors.server.controller.js'));
Note that the file path is relative to the root directory of your app and path module will handle that for you.
Solution 2: Path relative to the current file:
Since they are both in the same directory:
var errorHandler = require('./errors.server.controller.js');