A simple gem to tell you which controller and action is rendering the page.
LookInside is a Railtie meant for use with Rails.
Simply include it in your Gemfile:
gem 'lookinside'
LookInside provides a helper method for layouts as well.
The look_inside method can be used like:
<body class="<%= look_inside %>">
This will show you which controller and action rendered the current page. For example, Pages#Home would produce:
<body class="pages#homes">