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Would concerns help me share logic for partials? I see Rails 4 has the "concerns" folder for controllers, but it's empty on app generation.
DHH wrote a blog on concerns (but I think they are for the model): http://37signals.com/svn/posts/3372-put-chubby-models-on-a-diet-with-concerns
I would appreciate a concise example.
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A Rails Concern is a module that extends the ActiveSupport::Concern module. Concerns allow us to include modules with methods (both instance and class) and constants into a class so that the including class can use them.
A helper is a method that is (mostly) used in your Rails views to share reusable code. Rails comes with a set of built-in helper methods. One of these built-in helpers is time_ago_in_words . This method is helpful whenever you want to display time in this specific format.
Simply put:
Helpers contain methods to be used in views.
Concerns are modules to be included in controllers/models(depending which concern is it) etc.
It's just a folder with code that you could otherwise put in another place if you wanted. We use fancy terms like concerns to get paid more.
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