Rails 3.1 load controller from different path based on subdomain

问题

Is it possible to dynamically change the path from which controllers are used? Ryan Bates showed how to change the view_paths here: http://railscasts.com/episodes/269-template-inheritance

I'm making a CMS where a user can create a site and enter their own subdomain. I'd like "/" to point to "public#welcome" if there's no subdomain, but if there is a subdomain, I want it to point to "sites/public#welcome".

I'm using Rails 3.1 if that makes any difference.

回答1:

You should be able to solve this situation using constraints if I'm not mistaken (which I might, since I haven't actually tried the following yet):

constraints(:subdomain => /.+/) do
  root :to => 'sites/public#welcome'
end

root :to => 'public#welcome'

回答2:

I figured it out:

  constraints(:subdomain => /.+/) do
    scope :module => "sites" do
      root :to => 'public#welcome'
    end
  end

  root :to => 'public#welcome'

Now when a user visits "/" Sites::PublicController will be used if a subdomain exists, but just PublicController if no subdomain exits. Adding scope :module => "sites" do...end keeps my routes file simplistic and manageable.

来源：https://stackoverflow.com/questions/6442919/rails-3-1-load-controller-from-different-path-based-on-subdomain