node / mongoose: getting to request-context in mongoose middleware

Question

I\'m using mongoose (on node) and I\'m trying to add some additional fields to a model on save by using Mongoose middleware.

I\'m taking the often-used case of want

Answer 1

It can be done with 'request-context'. Step to do:

Install request-context

npm i request-context --save

In your app/server init file:

var express = require('express'),
app = express();
//You awesome code ...
const contextService = require('request-context');
app.use(contextService.middleware('request'));
//Add the middleware 
app.all('*', function(req, res, next) {
  contextService.set('request.req', req);
  next();
})

In you mongoose model:

const contextService = require('request-context');
//Your model define
schema.pre('save', function (next) {
  req = contextService.get('request.req');
  // your awesome code
  next()
})