map.with_options(:conditions => {:subdomain => AppConfig['admin_subdomain']}) do |subdom|
  subdom.root :controller => 'subscription_admin/subscriptions',:action => 'index'
  subdom.with_options(:namespace => 'subscription_admin/',:name_prefix => 'admin_',:path_prefix => nil) do |admin|
    ...
  end
end

解决方法

namespace :admin do
  constraints subdomain: AppConfig['admin_subdomain'] do
    root to: 'subscription_admin/subscriptions#index'
    namespace :subscription_admin do
      resources :some_resources
        # RESTful routes
      end
    end
  end
end

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