Normal use cases in angular
If you have a parent directive and a child directive you create methods in the controller of the parent directive and re
Actually there is another way that is less verbose and is used by the angular ngModel itself:
var parentForm = $element.inheritedData('$formController') || ....
Basically they use the fact that the controllers are stored into the data property of the directive dom element.
Still a bit wired, but less verbose and easier to understand.
I don't see a reason why you cannot pass the required controllers into the injection locals for the directive controller.