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I have defined my helper function in Helper:
module CarsHelper
def my_helper
...
end
end
But I can neither used it(my_helper) in my CarsController nor in Car model, is it so that the custom helper can only be used in View?
Helpers are normally for views. But you can include them in your controllers as well. Just add
to your controller. (docs)
Models are out of scope for helpers. Use class or instance methods in there instead.