解决方法
我为css命名空间做了类似的事情：
# config/initializers/action_view.rb
ActionView::TemplateRenderer.class_eval do
def render_template_with_tracking(template,layout_name = nil,locals = {})
# with this gsub,we convert a file path /folder1/folder2/subfolder/filename.html.erb to subfolder-filename
@view.instance_variable_set(:@_rendered_template,template.inspect.gsub(/(\..*)/,'').split('/')[-2..-1].join('-'))
out = render_template_without_tracking(template,layout_name,locals)
@view.instance_variable_set(:@_rendered_template,nil)
return out
end
alias_method_chain :render_template,:tracking
end
# application.html.erb
<body class="<%= :@_rendered_template %>" >