Send action to all components from controller

In my Ember app I have a model, which is an array loaded from backend. Each item describes a widget. Each widget type is represented by Ember component. User puts input in each widget and now all the widgets needs to be evalueated at once (after pressing a button, which is located outside of all components).

How to achieve that? I thought I could use ember-component-inbound-actions and send an action to each component, however I don't know, how to bind arbitrary number of widgets to arbitrary number of controller properties (strings don't work).