Run Railroad as a rake task

railroad.rb

#(Thanks to Thomas Ritz, http://www.galaxy-ritz.de ,for the code.)

  namespace :doc do
    namespace :diagram do
      task :models do
        sh "railroad -i -l -a -m -M | dot -Tsvg | sed 's/font-size:14.00/font-size:11.00/g' > doc/models.svg"
      end
  
      task :controllers do
        sh "railroad -i -l -C | neato -Tsvg | sed 's/font-size:14.00/font-size:11.00/g' > doc/controllers.svg"
      end
    end
  
    task :diagrams => %w(diagram:models diagram:controllers)
  end