How do I create a URL to link between apps in Padrino?

I have a separate app called "api" that I'd like to link to from my admin app. But if I do a link like:

%td=button_to "API", url("/api/users", :attributes, :id => user.id), 
  :method => :get, :class => :button_to

It takes me to /admin/api/u开发者_高级运维sers, I want to go to api/users/attributes.

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Not sure if I understand but if you are in App2 and you want to render a link from another app you can: Api.url(:users, :attributes, :id => user.id)