Rails – How to use a Helper Inside a Controller

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You can use

  • helpers.<helper> in Rails 5+ (or ActionController::Base.helpers.<helper>)
  • view_context.<helper> (Rails 4 & 3) (WARNING: this instantiates a new view instance per call)
  • @template.<helper> (Rails 2)
  • include helper in a singleton class and then singleton.helper
  • include the helper in the controller (WARNING: will make all helper methods into controller actions)

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