Mapping data in ember-data - ember.js

Question

I have a basic ember-data model object:
App.Group = DS.Model.extend({
//attributes
});
I have json which is structured like this:
root.levelone.leveltwo.property
I don't want to map this project as is but would like to map property in the json to property in the model like this:
App.Group = DS.Model.extend({
property: DS.attr('string')
});
Is it possible to define a mapping that is different from the incoming json? I don't have much control on what is coming from the server.
If this is not possible with ember-data, what is the best way to model this deep nesting?

Answer 1

FYI, the latest version of Ember (v.10) requires custom transforms to be defined on the DS.JSONTransforms object. And the 'to' and 'from' properties have been renamed to 'serialize' and 'deserialize'.

Answer 2

I'm not sure quite what you're asking but you can define custom DS.attr transforms.
Something like this maybe? Haven't tested it.
DS.attr.transforms.deepNest = {
from: function(serialized) {
return this.root2.property
},
to: function(deserialized) {
return { root2: property }
}
}
property: DS.attr('deepNest', {key: 'root1'})

Answer 3

IT changed FROM THIS:
DS.attr.transforms.object = {
from: function(serialized) {
return Em.none(serialized) ? {} : serialized;
},
to: function(deserialized) {
return Em.none(deserialized) ? {} : deserialized;
}
}
TO THIS:
DS.RESTAdapter.registerTransform('object', {
fromJSON: function(serialized) {
return Em.none(serialized) ? {} : serialized;
},
toJSON: function(deserialized) {
return Em.none(deserialized) ? {} : deserialized;
}
})

Answer 4

Ember data v 1.0 beta 2 requires this approach:
CustomTransform = DS.Transform.extend({
deserialize: function(serialized) {
...
},
serialize: function(deserialized) {
...
}
});
Ember.Application.initializer({
name: "customTransforms",
initialize: function(container, application) {
application.register('transform:custom', CustomTransform);
}
});