如何从URL删除子域？

Question

I followed the Railscast on adding subdomains to a Rails app, here , and everything is working great with the subdomains. Now I just can't figure out a way to link back to the root domain without a subdomain if the requested subdomain does not exist.

I've tried adding the following to my application_controller.rb file

redirect_to root_path(subdomain: false) if @city_or_state.nil?

where @city_or_state determines weather the requested subdomain is valid. The redirect_to goes back to the root, but does not remove the subdomain.

For example, if a user tries to go to invalid.domain.com they are redirected to the root, but subdomain is not removed.

I'm trying to get invalid.domain.com to redirect to domain.com

Answer 1

Ok, I got it. I had to use the following: redirect_to root_url(:host => request.domain)

When I tried root_path(:host => request.domain) it didn't work. Only works with root_url .

I found the answer on some comments from Daniel Kehoe here

When attempting to visit a domain that does not exist, the invalid subdomain is removed from the URL.

Answer 2

You can try this way i think it works! In the application_controller.rb you can add a before_filter :validate_subdomain Then you add this code to the controller:

private 
def validate_subdomain
   # @city_or_state must be initialized before this 
  if @city_or_state.nil?
   redirect_to request.domain
  end
end