In addition, we've been working with a bunch of really smart Rails people like Steve Klabnik and Santiago Pastorino on projects like ActiveModel::Serializers[2] and rails-api[3].
That being said, we know that there are a lot of different ways to serialize and transmit records, so we've designed the architecture of Ember Data such that those decisions are encapsulated in specific objects which we call adapters. You can think of it like the adapters for different databases for ORMs like ActiveRecord.
The default adapter, though, is RESTful JSON, and is what we use in all of our applications. You can see the implementation on GitHub[4].
1: http://emberjs.com/guides/models/the-rest-adapter/
2: https://github.com/rails-api/active_model_serializers
3: https://github.com/rails-api/rails-api
4: https://github.com/emberjs/data/blob/master/packages/ember-d...