… check that the asset does exist.
I had the following code in my application layout template:
<!DOCTYPE html>
<html>
<head>
<title>My webpage title</title>
<%= stylesheet_link_tag 'default' %>
<%= stylesheet_link_tag @current_subdomain %>
<%= javascript_include_tag :defaults %>
<%= csrf_meta_tag %>
</head>
It works great to load a custom stylesheet depending on the current subdomain, however I noticed that for some subdomains Rails was not adding the asset_id:
<link type="text/css" rel="stylesheet" media="screen" href="/stylesheets/default.css?1307960871">
<link type="text/css" rel="stylesheet" media="screen" href="/stylesheets/sample.css">
It is because sample.css must exist. stylesheet_link_tag does not check for the existence of the asset, and if it doesn’t exists it doesn’t add the asset timestamp.
Hope it saves you some time.