Heroku - Rails 3.1 Asset Pipeline

application.rb

if defined?(Bundler)
  # If you precompile assets before deploying to production, use this line
  # Bundler.require *Rails.groups(:assets => %w(development test))
  # If you want your assets lazily compiled in production, use this line
  Bundler.require(:default, :assets, Rails.env)
end

mongoid.yml

<% if ENV['MONGOHQ_URL'] %>
staging:
  uri: <%= ENV['MONGOHQ_URL'] %>

production:
  uri: <%= ENV['MONGOHQ_URL'] %>
<% end %>