Rails: Dry content_for before yield

856 Views Asked by rolele At 24 April 2025 at 07:05

I have a partial that need to include some js: view/main/_address_slider.html.erb

<% content_for :scripts  do %>
<%= javascript_include_tag 'swipeslider/dist/idangerous.swiper.min' %>
<%= javascript_include_tag 'fineuploader' %>
<% end %>
...

I have a testing page: view/main/test_partial_address_slider.html.erb

<% content_for :scripts  do %>
<%= javascript_include_tag 'swipeslider/dist/idangerous.swiper.min' %>
<%= javascript_include_tag 'mycustomplugin' %>
<% end %>
<% render 'address_slider' %>

I have a specific test layout: view/layouts/test.html.erb

<!DOCTYPE html>
<head>
<meta charset="utf-8">
<meta name="description" content="Social Network">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title><%= @meta_title %></title>
<%= yield :meta %>
<%= yield :styles %>
<%= yield :scripts %>
</head>
<body>
<div id="page">
<%= display_flash %>
<%= yield %>
</div>
</body>
</html>

Than in my controller: controllers/main_controller

def test_partial_address_slider
render "test_partial_address_slider", layout: "test"
end

The rendered page contains the js import of swipeslider/dist/idangerous.swiper.min twice.

<head>
<meta charset="utf-8">
<meta name="description" content="Social Network">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>....</title> 
<script src="/assets/swipeslider/dist/idangerous.swiper.min.js?body=1" type="text/javascript"></script>
<script src="/assets/swipeslider/dist/idangerous.swiper.min.js?body=1" type="text/javascript"></script>
<script src="/assets/fineuploader.js?body=1" type="text/javascript"></script>
<script src="/assets/mycustomplugin.js?body=1" type="text/javascript"></script>
</head>

Can I remove the duplicate from the content_for before the yield in my layout?

Original Q&A

There are 2 best solutions below

prcu On 22 November 2014 at 12:34

You can use helper like this:

def yield_something_once
  unless @yielded_something
    @yielded_something = true
    content_for :something
  end
end

Or just use content_for(:smth, '') right after yield :smth to clear it.

rolele On 22 November 2014 at 13:11

I found a fix but it looks horrible!

<% s = yield(:scripts)  %>
<%= (((s.split("<script").uniq.collect{|x| x.strip}).reject(&:empty?)).map! { |word| "<script #{word}" }).join("\n").html_safe %>

Rails: Dry content_for before yield

There are 2 best solutions below

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