controller.rb

class NewsController < ApplicationController

  meta_data :news, [:index]

  def index
    puts "page = #{@page}"
    render text: @page
  end
end

something.rb

class ApplicationController
  
  def self.meta_data(page, actions)
    before_filter "load_meta_page_#{page}".to_s, only: actions
  end

  def method_missing(method, *arguments)
    puts "method missing #{method}, #{arguments}"
    if match_data = /^load_meta_page_(.+)$/.match(method)
      load_meta_page match_data[1]
    end
  end

  def load_meta_page(slug)
    #load page by slug
    @page = "#{slug} page"
  end
end