We recently launch subdomain & custom domain features in our product: Logdown, a Markdown Blogging Platform.
People keep asking me how to implement, here is how :
constraints(Subdomain) do get '/' => 'posts#index' resources :posts do collection do get :search end end end
And in Subdomain class:
If it doesn't match logdown.com & www.logdown.com, then it goes straight to the constraint routing.
class Subdomain def self.matches?(request) case request.host when Setting.host, "www.#{Setting.host}", nil false else true end end end
In PostsController, we also build a method find_blog to find @current_blog.
The sequences will be : subdomain => custom domain => Not Found
class PostsController < ApplicationController before_filter :find_blog def find_blog case request.host when "www.#{Setting.host}", Setting.host, nil else if request.host.index(Setting.host) @current_blog = Blog.find_by_subdomain(request.host.split('.').first) else @current_blog = Blog.find_by_fqdn(request.host) end if !@current_blog redirect_to Setting.domain end end end end
server { listen 80 default; ..... }
The code is very simple, but it tooks me lots of time to figure out...