#123 Subdomains (revised)

Jan 13, 2012 | 7 minutes | Routing, Rails 3.1

In Rails 3.1 subdomains are easier than ever to use. Here I show how to route a subdomain to a specific controller action, generate links, nest resources, and more.

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          config/routes.rb
        
match '', to: 'blogs#show', constraints: {subdomain: /.+/}
# or to skip www:
match '', to: 'blogs#show', constraints: lambda { |r| r.subdomain.present? && r.subdomain != 'www' }

          blogs_controller.rb
        
def show
  @blog = Blog.find_by_subdomain!(request.subdomain)
end

          blogs/index.html.erb
        
<%= link_to blog.name, root_url(subdomain: blog.subdomain) %>

          articles_controller.rb
        
before_filter :load_blog

def show
  @article = @blog.articles.find(params[:id])
end

          application_controller.rb
        
private

def load_blog
  @blog = Blog.find_by_subdomain!(request.subdomain)
end

          config/environments/production.rb
        
# If you have a longer top level domain such as "example.co.uk"
config.action_dispatch.tld_length = 2