I have a couple lines of duplicate code
Ember.$(".close").trigger('click'); window.parent.showRegister();
in: adapters, controllers and routes.
Where the best place to write helper (function or action) and executing this in different places.
For example I can write function in controller, but I don't know how access controllers in RESTAdapter.
The main reason why you can or can't access to some abstractions from another is control of software complexity, an attempt to keep it to a minimum. There are principles like SOLID, low coupling / high cohesion to follow which helps us to maintain complex software systems, to increase comprehensibility of a system and to decrease possibility of an error in development process.
Ember is follow the MVC pattern in some way, and because of that I wouldn't advise (1) to keep code for DOM manipulation in controller/adapter/router and (2) to couple adapters, controllers and routes in such a way. I'am sure there is a way to put this code in View or in module outside of Ember.App classes; or to set up routing map handling this case.
If it's not the case or you need a simple and straight solution, you can use ugly-magic constructions to access anything from everywhere in Ember:
App.__container__.lookup('controller:controllerName'); // controllers
App.__container__.lookup('router:main'); // routes
App.__container__.lookup('store:main'); // store, adapters, serializers
Ember.View.views['emberViewId'] // objects are dying here occasionally
Double underscore tells us that this is not the recommended way to build communications in application. :)
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