Error while processing route error in ember.js with ember-data

Question

I'm trying to create an app using ember.js and ember-data, using the following versions:

DEBUG: Ember      : 1.7.0
DEBUG: Ember Data : 1.0.0-beta.9
DEBUG: Handlebars : 1.2.1
DEBUG: jQuery     : 2.1.0 

I'm using the RESTAdapter to connect to an api I wrote using node.js.

As soon as I load the app I keep getting the following error:

Error while processing route: students undefined is not a function TypeError: undefined is not a function
    at http://localhost:9000/scripts/vendor/ember-data.js:12006:34
    at tryCatch (http://localhost:9000/scripts/vendor/ember.js:45818:16)
    at invokeCallback (http://localhost:9000/scripts/vendor/ember.js:45830:17)
    at publish (http://localhost:9000/scripts/vendor/ember.js:45801:11)
    at http://localhost:9000/scripts/vendor/ember.js:29069:9
    at DeferredActionQueues.invoke (http://localhost:9000/scripts/vendor/ember.js:634:18)
    at Object.DeferredActionQueues.flush (http://localhost:9000/scripts/vendor/ember.js:684:15)
    at Object.Backburner.end (http://localhost:9000/scripts/vendor/ember.js:147:27)
    at Object.Backburner.run (http://localhost:9000/scripts/vendor/ember.js:202:20)
at apply (http://localhost:9000/scripts/vendor/ember.js:18382:27)

Here's the code I'm using (loaded in the same order I pasted it):

app.js

var App = window.App = Ember.Application.create({
    LOG_ACTIVE_GENERATION: true,
    LOG_TRANSITIONS: true,
    LOG_TRANSITIONS_INTERNAL: false,
    LOG_VIEW_LOOKUPS: true
});

store.js

App.ApplicationAdapter = DS.RESTAdapter.extend({
    host: 'http://localhost:3000',

    serializer: DS.RESTSerializer.extend({
        primaryKey: function(type) {
            return '_id';
        },

        serializeId: function(id) {
            return id.toString();
        }
    })
});

models/student.js

App.Student  = DS.Model.extend({
    firstName: DS.attr('string'),
    lastName: DS.attr('string'),
    nationality: DS.attr('string'),
    createdAt: DS.attr('date')
});

routes/app_route.js

App.StudentsRoute = Ember.Route.extend({
    model: function() {
        return this.store.find('student');
    }
});

router.js

App.Router.map(function () {
    this.resource('students', {path: '/'});
});

And the following is the response of the API:

{
    students: [
        {
            nationality: "Lorem",
            lastName: "Doe",
            firstName: "John",
            _id: "53f87200f3750319b4791235",
            createdAt: "2014-08-23T10:50:40.661Z"
        },
        {
            nationality: "Lorem",
            lastName: "Doe",
            firstName: "John",
            _id: "53f87299f3750319b4791234",
            createdAt: "2014-08-23T10:50:40.661Z"
        }
    ]
}

It looks like the store is not loading the data from the API, but the JSON data format looks fine. Any idea of what could be wrong?

Thanks!

Answer 1

So after searching more on Stack Overflow, I've figured out that the serializer has now to be in a separate class than the RESTAdapter, so the working code is the following:

store.js

App.ApplicationAdapter = DS.RESTAdapter.extend({
    host: 'http://localhost:3000'
});

App.ApplicationSerializer = DS.RESTSerializer.extend({
    primaryKey: '_id',
    serializeId: function(id) {
        return id.toString();
    }
});

Answer 2

Here's an updated answer for people using ember-cli.

ember g adapter application #=> creates app/adapters/application.js
ember g serializer application #=> creates app/serializers/application.js

In app/adapters/application.js:

import DS from 'ember-data';

export default DS.RestAdapter.extend({
  host: 'http://localhost:3000'
});

In app/serializers/application.js:

import DS from 'ember-data';

export default DS.RESTSerializer.extend({
  primaryKey: '_id',
  serializeId: function(id) {
    return id.toString();
  }
});

Answer 3

I was getting this error, and it had nothing to do with any of the usual suspects.

In coffeescript, I had started defining a model.

 App.Cost = DS.Model.extend
   amount:         DS.attr 'number'
   active:         DS.attr 'boolean'

To create a second model, I c/p my first model in and deleted the attributes:

  App.Cost = DS.Model.extend

The went back and tried to run a seemingly unrelated model

 localhost:3000/products

Which resulted in the error

 Error while processing route: products.index

Simply making sure my model was named correctly solved the error:

 App.Cost = DS.Model.extend(...)
 App.Price = DS.Model.extend(...)   <- instead of repeating the Cost model

This was re-produceable, so I thought it might be helpful to others.