jonathanjulian.com

Beware rendering multiple partials with layouts

Want to render more than one partial with the same layout in your page? Beware:


<%= render :partial => ‘p1′, :layout => ‘layouts/p_layout’ %>
<%= render :partial => ‘p2′, :layout => ‘layouts/p_layout’ %>


layouts/p_layout.html.erb


<%= yield :top %>
<%= yield %>
<%= yield :bottom %>
<hr/>


_p1.html.erb


<% content_for :top, 'HeaderFor1' %>
<% content_for :bottom, 'FooterFor1' %>
Content!


_p2.html.erb


<% content_for :top, 'HeaderFor2' %>
<% content_for :bottom, 'FooterFor2' %>
Content!


Did you expect this?

HeaderFor1 Content! FooterFor1

---

HeaderFor2 Content! FooterFor2

---

Nope. You get this:

HeaderFor1 Content! FooterFor1

---

HeaderFor1HeaderFor2 Content! FooterFor1FooterFor2

---

The instance variables in the layout object retain their values, even between invocations of render. My workaround (since I’m not sure if some would call this a “feature”)…clear the instance variables at the end of your layout.


<%= yield :top %>
<%= yield %>
<%= yield :bottom %>
<hr/>
<% @content_for_top, @content_for_bottom = nil %>


Now it works as I expected.

blog comments powered by Disqus