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Editorial Team
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Asked: 2026-05-26T11:21:23+00:00

I have multiple partials which may or may not be included in a given

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I have multiple partials which may or may not be included in a given layout… and they often have javascript required for just the content of that partial… but I want the javascript loaded in the head.

so I’ll generally have something like:

<html>
  <head>
    <title><%= @page_title %></title>
    <%= yield :head %>
  </head>
...etc

and in partial 1:

<% content_for :head do %>
      <%= javascript_tag 'partial_one_js' %>
<% end %>

and in partial 2:

<% content_for :head do %>
      <%= javascript_tag 'partial_two_js' %>
<% end %>

But whichever is defined second blows away the content coming from the first.

There is no way to combine the partials.

I’d like to be able to concatenate them without doing something totally hacky. It also has to work if only one or neither is present.

… and I’d especially rather avoid:

<html>
  <head>
    <title><%= @page_title %></title>
    <%= yield :head_one %>
    <%= yield :head_two %>
  </head>

… ick

So… does anybody have a solution?

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1 Answer

  1. Editorial Team

    Use content_for to retrieve the stored content rather than yield.

    <html>
  <head>
    <title><%= @page_title %></title>
    <%= content_for :head %>
  </head>
...etc

    From the source docs:

    # Note that content_for concatenates the blocks it is given for a particular
# identifier in order. For example:
#
#   <% content_for :navigation do %>
#     <li><%= link_to 'Home', :action => 'index' %></li>
#   <% end %>
#
#   <%#  Add some other content, or use a different template: %>
#
#   <% content_for :navigation do %>
#     <li><%= link_to 'Login', :action => 'login' %></li>
#   <% end %>
#
# Then, in another template or layout, this code would render both links in order:
#
#   <ul><%= content_for :navigation %></ul>
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