DRY question

rubyonrails-talk
1

I need to have the exact same method available in all controllers and in all views. Right now, I have it repeated in app/controllers/ application_controller.rb and app/helpers/application_helper.rb. In DRY tradition, what's the best way to only have it in one place? TIA, Craig

2

Just put it in a helper and include that helper in ApplicationController like this

include MyHelperWithGlobalStuffInIt

3

You're right, putting

include ApplicationHelper

into application_controller.rb does the trick.

But wasn't that what

helper :all # include all helpers, all the time

was supposed to do?

Or do I misunderstand?

4

I’ve wondered about that too. That doesn’t work for me either. It doesn’t raise an error but doesn’t include :all either.

5

You do :-). The helper method controls which of your helpers (in app/ helpers) are available to the views for that controller. Without the helper :all call, by default views rendered by foo_controller will get helper methods from foo_helper. You can name specific modules, so for example if you a bunch of common helpers in app/helpers/ common_helpers.rb then you say helper :common_helpers or helper CommonHelpers to add that module for the controller in question.

helper :all means add all of the helpers from app/helpers to all of your views.

Another way of solving the original problem is declaring the method in application_controller and then saying

helper_method :some_helper

which takes the named controller method and makes it into a view helper.

Fred

6

> Or do I misunderstand?

You do :-). The helper method controls which of your helpers (in app/ helpers) are available to the views for that controller.

Ahhhhh. So *that's* what it's there for! :slight_smile:

Another way of solving the original problem is declaring the method in application_controller and then saying

helper_method :some_helper

which takes the named controller method and makes it into a view helper.

Thanks! Craig