Ember-Data: How do “mappings” work

Question

I\'m currently trying to put something together with ember + emberdata + router + asp.net web api. Most of it seem to work, however I stuck in an error message I get when em

Answer 1

The mapping can be defined in the DS.RESTAdapter. I think you could try to define something like this:

App.Store = DS.Store.extend({
  adapter: DS.RESTAdapter.create({
    bulkCommit: true,
    mappings: {
      genres: App.Genre
    },
    // you can also define plurals, if there is a unregular plural
    // usually, RESTAdapter simply add a 's' for plurals.
    // for example at work we have to define something like this
    plurals: {
      business_process: 'business_processes' 
      //else it tries to fetch business_processs
    }
  }),
  revision: 4
});

Hope this resolves your problem.

Update:

At this time, this is not well documented, I don't remember if we found it by ourself reading the code, or perhaps Tom Dale pointed on it.
Anyway, here is the point for plurals For the mappings, I think we were driven by the same error as you, and either we tried, either Tom teached us about this.

Answer 2

The RESTAdapter expects the returned JSON to be of the form:

{
  "genres": [{
    "id": 1,
    "name": "action"
  },{
    "id": 2,
    "name": "Drama"
  }]
}

The tests are a good source of documentation, see https://github.com/emberjs/data/blob/master/packages/ember-data/tests/unit/rest_adapter_test.js#L315-329

Answer 3

I'm using Ember Data rev. 11 and it seems that the plurals config in DS.RESTAdapter.create never works. I looked into the codes and found a solution as following:

App.Adapter = DS.RESTAdapter.extend({
  bulkCommit: false
})

App.Adapter.configure('plurals', {
  series: 'series'
})