在默认路由中，request/posts/:id映射到带有:format => "html"的"show"操作.我在show action中使用了一些xhtml元素，除非:content_type设置为xml，否则无法正确呈现这些元素.我目前正在通过渲染秀来解决这个问题.xml.erb和手动设置内容类型，如下所示:
format.html { render :template => "/posts/show.xml.erb",
:locals => {:post => @post}, :content_type => "text/xml" }
但这似乎很愚蠢.我如何更改routes.rb，以便将/posts/:id路由为format=>"xml"？谢谢
Default format for requests:
可以使用默认哈希将给定路由的默认格式设置为xml.
例如:
# single match defaulting to XML (/plots/1 is the same as /plots/1.xml)
match 'posts/:id' => 'posts#show', :defaults => { :format => 'xml' }
# using resources, defaulting to XML (all action use XML by default)
resources :posts, :defaults => { :format => 'xml' }
# using resources and mixing with other options
resources :posts,
:only => [:new, :create, :destroy],
:defaults => { :format => 'xml' }
搜索official Ruby on Rails routing guide始终是一个好主意，它相当深入，对于任何路由问题都是一个非常好的第一站资源.