trying to execute __FILE__ on a different file using inheritance and callbacks in Ruby 1.8.7

application_controller.rb

class ApplicationController
  #logs of code omitted
  
  before_filter :define_file_locator

  def define_file_locator
    self.class.send :define_method, :log_file_location, lambda {
        instance_eval 'Rails.logger.info "File location: #{__FILE__}"'
    }
    log_file_location
  end
end

this isn't gonna work. it was kind of a shot in the dark. I wonder if Rubinius would do any better