gistfile1.rb

class ApplicationController
  before_fitler :autfind_stuff
  
  def self.autofinders
    @autofinders ||= []
  end
  
  def self.autofind(param, &block)
    autofinders << [param, block]
  end
  
  def autofind_stuff
    ApplicationController.autofinders.each do |param, block|
      if params.has_key?(param)
        instance_exec params[param], &block
      end
    end
  end
  
  
  autofind :user_id do |user_id|
    @user = User.find(user_id)
  end
  
  autofind :commend_id do |comment_id|
    @comment = Comment.find(comment_id)
  end
end