title: Rails Layout Rendering with controller condition
body: <p>I don't know what's the best way to doing this.</p>
  
  <p>On my application.html.erb I define a header div.</p>
  
  <p>My default controller ( root ) is a homepage controller. 
  And I wish that if I'm at index of the homepage the header is rendering with some content, but all other controllers render another content inside that header.</p>
  
  <p>How can I make a condition in that header div to render different content based on the controller that's being rendered?</p>