Engine asset compilation on heroku

gistfile1.rb

module Pandemic
  class Engine < ::Rails::Engine
    isolate_namespace Pandemic

    initializer "pandemic.asset_addition", :group => :all do |app|

      initializer_path = "#{Rails.root}/config/initializers/pandemic.rb"

      # Forces rails to pull in the initializer even if initialize_on_precompile
      # is false
      require initializer_path if File.exist? initializer_path

      # Enabling assets precompiling under rails 3.1
      if Rails.version >= '3.1'
        if Pandemic.is_server
          Rails.application.config.assets.precompile += %w( pandemic/**.js pandemic/**.css )

        elsif Pandemic.is_client
          Rails.application.config.assets.precompile += %w( pandemic/tracking/pandemic.js )
        end
      end
    end

  end
end