gistfile1.js

App.TagsController = Ember.ArrayController.extend {
	filterOn: null

	setFilterOn: (tagId)->
		if this.get('filterOn') == tagId
			this.set 'filterOn', null
		else
			this.set 'filterOn', tagId

		console.log('in tagscontroller')
	}


App.TasksController = Ember.ArrayController.extend {
	filterOnBinding: 'App.TagsController.filterOn'

	updateTest: (->
		console.log('here')
	).observes('filterOn')
	}