ruby-on-rails – 如何处理Rails资源路由中的点字符？

我希望像这样有SEO优化的网址

http://example.com/sites/1-blau.de/plans

但路径中的点导致Rails陷入困境.如何将点转换为百分比表示形式,以便它可以工作？

我的路线：

resources :sites, only: [] do
  resources :plans, only: [:index, :show] do
  end
end

我尝试过URI.escape和CGI.escape,但都没有用.

URI.escape('a.b')=> "a.b"
CGI.escape('a.b')=> "a.b"

我以为我想要什么

Foo.escape('a.b')=> "a%2Eb"

使用接受点字符的约束.

get 'sites/:site_name/plans', constraints: { site_name: /[a-zA-Z0-9\.]+/ }

从doc：

By default, dynamic segments don’t accept dots – this is because the dot is used as a separator for formatted routes. If you need to use a dot within a dynamic segment, add a constraint that overrides this – for example, id: /[^/]+/ allows anything except a slash.