Rails check if yield :area is defined in content_for

Solution 1:

@content_for_whatever is deprecated. Use content_for? instead, like this:

<% if content_for?(:whatever) %>
  <div><%= yield(:whatever) %></div>
<% end %>

not really necessary to create a helper method:

<% if @content_for_sidebar %>
  <div id="sidebar">
    <%= yield :sidebar %>
  </div>
<% end %>

then of course in your view:

<% content_for :sidebar do %>
  ...
<% end %>

I use this all the time to conditionally go between a one column and two column layout

<%if content_for?(:content)%>
  <%= yield(:content) %>
<%end%>