Using a partial render across all pages in a app

I have written a test app with a Controller called pages. Pages has index, about, contact, and doc in the Pages controller. I want to create a widget that is a partial render that will be included in all of them with the default layout. The widget will display data from a model. I got this to work by creating a variable in each method in the Pages controller that are all the same thing. Howdo I do this without duplication all that effort?

For example in my Pages controller I have:
class PagesController < ApplicationController
  
  def index
    @blah="42"
  end

  def contact
     @blah="42"
  end

  def about
     @blah="42"
  end

  def doc
     @blah="42"
  end
end

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I want to provide the data to the partial without having to repeat it everywhere.
LinuxInAtlantaAsked:
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kristinalimConnect With a Mentor Commented:
Check out ActionController::Base filters:

class PagesController < ApplicationController
  # This would call :set_categories before calling corresponding
  # action-specific methods.
  before_filter :set_categories

  def action_a
  end

  def action_b
  end

  protected

  def set_categories
    @categories = Category.find(:all)
  end
end

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If you don't want the method to be called for all actions, you can specify :only or :except options to the before_filter call.
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James MurrellProduct SpecialistCommented:
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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