From: Andrew Dangerfield <andrew.dangerfield@...>
Date: 2011-01-23T12:58:21+09:00
Subject: How to use image_tag method from module ActionView::Helpers::AssetTag?

I am just getting started using ruby and rails and I have a simple class
I am refactoring with rspec and am getting the error "NoMethodError:
undefined method 'image_tag'" so I know I am doing something wrong with
bringing in the module but I do not know what and hope someone can
possibly give me some assistance.  Here is the relevant code from the
class:

***********************************************************************
require 'rubygems'

class Helper

  def self.foo
    "foo"
  end

  def show(profile, size, html = {}, options = {}, link = true)
    ... nonrelevant code ...
    return image_tag("default.png")
  end
end
***********************************************************************

I have tried adding "require 'action_view/helpers/asset_tag_helper'" to
the top of the file containing the class and have tried putting "include
ActionView::Helpers::AssetTagHelper" into the body of the class but have
been unsuccessful so far.  My main programming language is C/C++ where a
simple "include" would usually do the trick in a situation like this so
I am guessing that I just have not come across the documentation on the
correct way to bring in such a module.

Can anyone tell me what I am doing wrong, point me to a tutorial, or
give me a short example of the right way to use that "image_tag" method?

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