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https://api.rubyonrails.org/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://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 …
http://engineering.appfolio.com/appfolio-engineering/2013/06/17/ruby-mixins-activesupportconcern
Jun 17, 2013 · Is every mixin a Concern? No. Is every ActiveSupport::Concern a Concern? No. While I've used ActiveSupport::Concern to build actual Concerns, I've also used it to avoid writing out the boilerplate code mentioned above. If I just need to share some instance methods and nothing else, then I'll use a bare module.
http://blog.coreyhaines.com/2012/12/why-i-dont-use-activesupportconcern.html
I don't use ActiveSupport::Concern. Unlike other Rails-based bastardization of concepts and names, ActiveSupport::Concern has very little to do with common connotations of "concern." It tightly couples a useful design concept to a single, possibly-least-optimal implementation of the idea (mixins).
https://stackoverflow.com/questions/15953332/rails-including-a-concern-with-a-constant-within-a-concern
It appears this behavior is by design, as explained nicely over here.. What you'll need to do in this case is not have Group::Constants extend from ActiveSupport::Concern since that will block its implementation from being shared with other ActiveSupport::Concern extending modules (although it will be ultimately shared in a class that includes the second module):
https://ruby-china.org/topics/19812
Mar 29, 2019 · ActiveSupport::Concern 被引入到 rails. 根据这篇文章 put-chubby-models-on-a-diet-with-concerns 中这样一段话把它的意思说的很明白了：. This concern can then be mixed into all the models that are taggable and you’ll have a single place to update the logic and reason about it.
http://activesupport.force.com/usersupport/
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https://apidock.com/rails/ActiveSupport/Concern
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
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