Rake task for asset precompiling

yourapp.rake

namespace :yourapp do
  desc "Precompiles assets"
  task :precompile_assets do
    ENV["RAILS_GROUPS"] = ENV['RAILS_ENV'] = 'development'
    Rake::Task["environment"].invoke
    
    YourApp::Application.configure do
      config.assets.debug = false
      config.assets.compress = true
      config.assets.compile = true
      config.assets.digest = true  
      config.assets.precompile = [ /^(?:(?!js|css).)+$/, /application.(css|js)$/ ]
      config.sass.load_paths << "#{Gem.loaded_specs['compass'].full_gem_path}/frameworks/compass/stylesheets"
    end
    
    Rake::Task["assets:precompile"].invoke
  end
end