Meteor Reactivity by transformed sub-collection

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1

Is it possible to implement reactivity by a sub-class with a transformed collection?

This is the example code of jamgold on the Meteor forum; the sub-class users is joined to the main-class collection_name. If something changes on the collection_name collection, Meteor is in fact reactive. However, when something changes on the sub-collection users, this is not reactively pushed to this publish.

Collection = new Meteor.Collection('collection_name');
if(Meteor.isServer)
{
	Meteor.publish('collection', function(query,options) {
		var self = this;
		var handler = null;
		query = query == undefined ? {} : query;
		options = options == undefined ? {} : options;
		//
		handler = Collection.find(query,options).observeChanges({
			added: function (id, doc) {
				var author = null;
				doc.author = Meteor.users.findOne({_id: doc.userId},{profile:1});
				self.added('collection_name', id, doc);
			},
			changed: function (id, fields) {
				self.changed('collection_name', id, fields);
			},
			removed: function (id) {
				self.removed('collection_name', id);
			}
		});
		self.ready();
		self.onStop(function () {
			if(handler) handler.stop();
		});
	});
}

if(Meteor.isClient)
{
	Meteor.subscribe('collection');
}