rake_test.rb

require 'rake'

dependency = {
  'all' => ['attr 1', 'attr 2', 'attr 3', 'attr 5'],
  'attr 1' => ['attr 2', 'attr 3'],
  'attr 2' => ['attr 5'],
  'attr 3' => [],
  'attr 5' => [],
}

dependency.each_pair do |key, value|
  task key => value do |t|
    puts "executing #{t}"
  end
end

Rake::Task['all'].invoke