问题
Is there a way to append or override the <head> page element inside a rails view?
Suppose I have something I only want to include in a particular view's <head>, and I am using the application.html.erb in order to render the rest of my views. In this case I do not want to discard application.html.erb but instead just append to it's head element for one particular page and nothing else.
回答1:
In your application.html.erb:
<head>
<% if content_for? :for_head %>
<%= yield :for_head %>
<% end %>
In your "specific" view:
<% content_for :for_head do %>
Something-to-put-in-head
<% end %>
:for_head isn't predefined: naming it is up to you. It could be anything.
来源：https://stackoverflow.com/questions/10225645/rails-override-head-page-element-when-using-a-partial-or-a-specific-controll