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https://api.rubyonrails.org/classes/ActiveSupport/Concern.html
Evaluate given block in context of base class, so that you can write class macros here. When you define more than one included block, it raises an exception.
https://api.rubyonrails.org/v5.1/classes/ActiveSupport/Concern.html
require 'active_support/concern' module Foo extend ActiveSupport::Concern included do def self.method_injected_by_foo ... end end end module Bar extend ActiveSupport::Concern include Foo included do self.method_injected_by_foo end end class Host include Bar # It works, now Bar takes care of its dependencies end
https://stackoverflow.com/questions/14541823/how-to-use-concerns-in-rails-4
The problem I have with concerns is that they add functionality directly to the model. So if two concerns both implement add_item, for example, you're screwed.I remember thinking Rails was broken when some validators stopped working, but someone had implemented any? in a concern. I propose a different solution: use the concern like an interface in a different language.
https://github.com/rails/rails/blob/master/activesupport/lib/active_support/concern.rb
Apr 17, 2019 · rails / activesupport / lib / active_support / concern.rb Find file Copy path okuramasafumi Add documentations to AS::Concern#included and #class_methods 8dcce70 Apr 17, 2019
https://www.sitepoint.com/dry-off-your-rails-code-with-activesupportconcerns/
Oct 13, 2016 · Your codebase is neat and your controllers are thin, thanks to concern. Concerns in Models. ActiveSupport::Concern works in Rails models, just like we saw in …
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