HOW TO invoke application_helper's method in a specific CategoryHelper

for the purpose of reuse i put some method on applciation_helper,now i want to invoke this method on a specific helper like CategoryHelper,

is i need do something else?

Application_helper.rb
def ad_materials(a)
   d开发者_如何学运维o sth
end


CategoryHelper.rb
ad_materials("dd")#this method define on application_helper,but it didnt' work

is this a commany way to use common method put them in application_helper or any other recommend way,hope someone could give me a hand,thanks

i have re-edited the question,to make it clear,hope someone help again

---

If you call helper :all in your application_controller, then any helper will be available in any view.

Example:

app/helpers/application_helper.rb

module ApplicationHelper
  def helper(object)
    object.to_s
  end
end

app/controllers/application_controller.rb

class ApplicationController < ActionController::Base
  helper :all
end

app/views/other_objects/show.html.erb

<%= helper(other_object) %>

Is this what you are asking?

---

It doesn't really matter where you put the helpers in terms of how your application finds them. But you do need to define and end your helpers such as

def ad_materials("dd")
    do stuff here
end 

---

If you're saying "how do I invoke a ApplicationHelper methods from CategoryHelper" I've ran into this problem. My less than elegant workaround was this:

module ReusableHelpers
  def ad_materials(a)
    do sth
  end
end

module ApplicationHelper
  ...
  include ReusableHelpers

  ...
end

module CategoryHelper
  include ReusableHelpers

  def show_pastries_only    
    ad_materials("cherry")
  end
end