如果子域不存在，如何重定向请求？

Question

I've setup a current project with subdomains based on this Railscast. I have two models, State and City that each have a :subdomain field in their dataset. If a user enters a subdomain that matches this :subdomain it presents the appropriate content.

How can I redirect a request if the subdomain does not exist in either the State or City model? For example, I would want blue.domain.com to be redirected to the rails_root .

Can someone provide a little guidance on how to redirect if the requested domain does not exist?

Answer 1

If your controller, you'll want to add a before_filter where you find the city or state, and then redirect away if not found. Something like:

before_filter :find_subdomain

def find_subdomain
  @city_or_state = City.find_by_subdomain(request.subdomain) || State.find_by_subdomain(request.subdomain)
  redirect_to root_path(subdomain: false) if @city_or_state.nil?
end

Answer 2

This is just another way to do the same:

before_filter :find_subdomain

private
def find_subdomain
  @city_or_state = City.find_by_subdomain(request.subdomain) || State.find_by_subdomain(request.subdomain)
  redirect_to request.domain if @city_or_state.nil?
end