我有一个部分需要包含一些js：view/main/_address_slider.html.erb
<% content_for :scripts do %>
<%= javascript_include_tag 'swipeslider/dist/idangerous.swiper.min' %>
<%= javascript_include_tag 'fineuploader' %>
<% end %>
...
我有一个测试页面：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' %>
我有一个特定的测试布局：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>
比在我的控制器中：控制器/main_controller
def test_partial_address_slider
render "test_partial_address_slider", layout: "test"
end
呈现的页面包含两次 swipeslider/dist/idangerous.swiper.min 的 js 导入。
<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>
我可以在布局的产量之前从content_for中删除重复项吗？
你可以像这样使用帮助程序：
def yield_something_once
unless @yielded_something
@yielded_something = true
content_for :something
end
end
或者只是在yield :smth后立即使用content_for(:smth, '')来清除它。
我找到了一个修复程序，但它看起来很糟糕！
<% s = yield(:scripts) %>
<%= (((s.split("<script").uniq.collect{|x| x.strip}).reject(&:empty?)).map! { |word| "<script #{word}" }).join("n").html_safe %>