How to manually update an ArrayController - ember.js

Question

In my Application I have the following rawNodes property, which I am using as an application-wide cache:
var App = Ember.Application.createWithMixins({
...
/**
The rawNodes property is a nodes deposit to be used
to populate combo boxes etc.
**/
rawNodes: null,
getNodes: function () {
if (!this.rawNodes) {
this.rawNodes = this.Node.find();
}
},
...
});
In some of my controllers I am modifying data which should also be updated in this generic cache. I would like to implement a couple of functions, to update a given node, and to delete a given node. Something like:
updateNode: function(node_id, node) {
this.rawNodes.update(node_id, node);
},
deleteNode: function(node_id) {
this.rawNodes.delete(node_id);
}
But I do not really know how to work with an ArrayController, not even if those operations are at all possible. I see no examples of this kind of procedures in the ArrayController documentation. Could somebody offer an example, or point me in the right direction?

Answer 1

Rather than using a rawNodes property, I think it might be more useful to
maintain a Node model and a NodesController. Assign the model property
with setupController so you can be sure that nodes are always fetched.
Since this is an application-wide cache, use needs in ApplicationController so it can delegate to its methods.
App.ApplicationRoute = Em.Route.extend({
setupController: function() {
this.controllerFor("nodes").set("model", App.Node.find());
}
});
App.ApplicationController = Em.Controller.extend({
needs: "nodes",
});
App.NodesController = Em.ArrayController.extend({
getNodes: function() {
// ...
}
});
App.NodeController = Em.ObjectController.extend({
updateNode: function() {
// ...
},
deleteNode: function() {
// ...
}
});