How to use an RoR application template and still be able to add things to the html head?

Question

I'm learning RoR through this tutorial. In tute, an application.html.erb file is created in views/layouts. In the body, a content div is created, and the <%= yield %> line is used. The other views that are created are then just inserted into the content div in the body of the application template.

But there are a few views that I have where I need to add some javascript to the head. My question is, how can I use this structure, with a central application template, but also be able to put code into the head of the document? Thanks for reading.

Answer 1

Add <%=yield :header %> in your HTML head. Then, in a view:

<% content_for :header do %>
  <!-- Javascript here //-->
<% end %>

<!-- Rest of the page here //-->

The bit in the content_for block will render where your yield :header is in your template.