MongoDB not saving data

Question

MongoDB not saving data

I'm making an app with express and mongoose, https://github.com/findjashua/express_app

app.coffee
```
app.post '/user', user.add
```

models/user.coffee

createUser = (req) ->
    user = new User
        name : req.body.name
        email : req.body.email
        phone : req.body.phone
    return user

# ...

exports.add = (req, res) ->
    user = createUser req
    res.send dbService.save(user)

services/db.coffee

exports.save = (document)->
    document.save (err)->
        if err
            console.log err
        return document

When I make a post request to add a new user, it doesn't save anything and I can't think of any reason why. Any ideas?

node.js
mongodb
express
mongoose

Answer 1

document.save() is asynchronous, so return isn't really an option within dbService.save().

The res.send() will have already finished before return document is evaluated.
It also returns document to the code that called the callback, which is within document.save, not to your code within user.coffee.

You'll need to adjust dbService.save() to accept a callback so you can res.send() the finished document:

exports.save = (document, callback) ->
    document.save (err, document) ->
        if (err)
            callback(err)
        else
            callback(null, document)

exports.add = (req, res) ->
    user = createUser req
    dbService.save user, (err, user) ->
        res.send err ? user

Note: that 1st snippet can be simplified, depending on whether or not .save() needs to do anything else:

exports.save = (document, callback) ->
    document.save callback