Use GraphViz to construct a diagram of a Rails act as dag relation

Act-As-Dag Graph

desc 'Uses graphviz to construct a graph of SuperCategories'
task :super_category_graph => :environment do
  File.open('super_categories.dot', 'w') do |f|
    f.puts "digraph super_categories {\n"
    SuperCategory.all.each do |super_category|
      super_category.children.each do |child|
        f.puts %{"#{super_category.name}" -> "#{child.name}";\n}
      end
    end
    f.puts '}'
  end
  `dot -Tpng -o'super_categories.png' 'super_categories.dot'`
  `open super_categories.png`
end