Question

I have two models defined in Ember and also in a Rails application:

App.Library = DS.Model.create({
  books: DS.hasMany('App.Book')
});
App.Book = DS.Model.create({
  library: DS.belongsTo('App.Library')
});

On the back-end side, I have several Book for each Library, I would like to retrieve those books but there is no back-end call when I do this (library object is correct and has an id that match its id on the back-end):

var libraryBooks = library.get("books");

I am expecting a back-end call to my rails API in order to fetch all books for this specific library, but instead I just get the empty Ember.OrderedSet without back-end call.

I am starting with Ember so maybe this is not correct, if this is the case, what is the best way to retrieve the “hasmany” for a given model directly from the back-end if you only have the model’s id?

Answer 1

.find() will make ember do a request.

App.Library.find(1/* the id of the library*/).get('books');

it’ll to a request to /librarys/1 i think. You can configure the plural like this:

DS.RESTAdapter.configure("plurals", {
    library: "libraries"
});

Now the request will be to /libraries/1

You could also probably get the books by the library:

App.Book.find({library: 1});

the library: 1 you’ll have to handle yourself on the backend. emberdata sends it as a querystring. Like this: /books?library=1

Have a look here there is some documentation on ember-data