class BoardController < ActionController::Base
  before_filter :build_nav_bar_links
  
  def index
    ...
  end
  
  private
    def build_nav_bar_links
      @nav_bar_links = nav_bar_links
    end
  
    def nav_bar_links
      [["Something", something_url],
        ["Else", else_url]]
    end
end