For stackoverflow Q#6267059

README.mkdown

We needed a better example for http://stackoverflow.com/questions/6267059/make-all-actionviewer-helper-methods-available-in-a-module/6271730#6271730

Other Resources on using helpers outside of ActionView:

http://drawohara.com/post/24582894/rails-un-suckass-ing-actionview-helpers-in-the-name

The other approach to this task is to use helpers for just the view oriented portions, and Presenters which are tied to them heavily. http://gilesbowkett.blogspot.com/2007/10/my-version-of-rails-presenters.html http://blog.new-bamboo.co.uk/2007/8/31/presenters-conductors-on-rails Fat Models Aren't Enough - By the awesome Jef Casimir, available at http://dl.dropbox.com/u/69001/Fat%20Models%20Aren%27t%20Enough%20-%20DCRUG.pdf

http://pivotallabs.com/users/jdean/blog/articles/1706-form-backing-objects-for-fun-and-profit

forNoNameNo.rb

require 'rubygems'
gem 'actionpack', '~>3.0.0'
gem 'activesupport', '~>3.0.0'
require 'action_pack'
require 'action_view'
require 'active_support'
require 'active_support/core_ext'

module ApplicationHelper
  
  def does_things_with_content_tag
     content_tag :p
  end
  def does_things_with_image_tag
    image_tag 'a filename'
  end
  
end


require 'ostruct'



class ViewlessHelpable
  include ActionView::Helpers
  include ApplicationHelper
  ActionView::Helpers.constants.grep(/Helper$/i).each do |const|
    include ActionView::Helpers.const_get(const)
  end

  def call
    things = does_things_with_content_tag
    raise things unless things == '<p></p>'
  end
  def invalid_without_config
    
    things = begin
    #image_tag requires config.asset_path
    does_things_with_image_tag
    rescue NameError => exc; 
      #=> NameError: undefined local variable or method ‘config’ for #<ViewlessHelpable:0x10157f880>  
       #   method compute_public_path in asset_tag_helper.rb at line 742
      true
    end 
    raise exc unless things
  end
    
end

class ViewlessHelpableWithImages < ViewlessHelpable
  def config
    o =OpenStruct.new
    o.asset_path = "a path"
    o
  end 
  
  def controller
    Object.new
  end
  
  def call
    super()
      things = does_things_with_image_tag
      raise things unless things == '<img alt="A path" src="a path" />'
  end
end

require 'cgi'
class ViewlessHelpableWithImagePaths < ViewlessHelpable
  def path_to_image(source)
		"/images/#{CGI.escape(source)}"
	end
  
  def call
    super()
      things = does_things_with_image_tag
      raise things unless things == '<img alt="A+filename" src="/images/a+filename" />'
  end
end

ViewlessHelpable.new.call
ViewlessHelpable.new.invalid_without_config
ViewlessHelpableWithImages.new.call
ViewlessHelpableWithImagePaths.new.call