Remove Subdomain from String in Ruby

How do I remove a subdomain from URL?

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.

Subdomains in Rails 3 in url helpers

Turns out I want using the 'path' helpers', not the 'url' helpers :(. So, to make this work you need to use root_url, not root_path, etc.

Have Devise create a subdomain on registration

One subdomain per user is a fairly common use-case in web application development. Here's how you can do it:

First: ensure your Users table has a :name column (I think Devise does this by default - if not you can run rails g migration AddNameToUsers name:string to add this column to your database).

To use this User.name as a subdomain we’ll need to make sure it only contains alphanumeric characters (with an optional underscore). We’ll also limit the name to a maximum of 32 characters. Finally, we don’t want users to choose names such as “www” that will result in URLs such as “http://www.myapp.com”. Here's the validations for app/models/user.rb:

validates_format_of :name, with: /^[a-z0-9_]+$/, 
  message: "must be lowercase alphanumerics only"

validates_length_of :name, maximum: 32, 
  message: "exceeds maximum of 32 characters"

validates_exclusion_of :name, in: ['www', 'mail', 'ftp'], 
  message: "is not available"

Optionally: modify your db/seeds.rb (so it creates test users when you initialize the database):

user = User.create! :name => 'myname', :email => 'user@example.com', 
  :password => 'password', :password_confirmation => 'password'

We’ll display a profile page for a user when anyone enters a URL with a subdomain that matches an existing user app/controllers/profiles_controller.rb:

class ProfilesController < ApplicationController
  def show
    @user = User.where(:name => request.subdomain).first || not_found
  end

  def not_found
    raise ActionController::RoutingError.new('User Not Found')
  end
end

Here's an example file for the view app/views/profiles/show.html.erb:

<h1>Profile</h1>
<h3><%= @user.name %></h3>
<h3><%= @user.email %></h3>

Lastly we need to implement routing for the subdomains. Create a class like this:

class Subdomain
  def self.matches?(request)
    case request.subdomain
    when 'www', '', nil
      false
    else
      true
    end
  end
end

Make sure this class is autoloaded when the application starts config/application.rb:

config.autoload_paths += %W(#{config.root}/lib)

Ensure your routes.rb file contains the following routes:

devise_for :users
resources :users, :only => :show
constraints(Subdomain) do
  match '/' => 'profiles#show'
end

If you used rails generate for your profiles controller - ensure that you remove the get "profiles/show" route.

See this page for information on using URL Helpers in your application (essentially you'll need to use new_user_session_url instead of new_user_session_path and you can specify a subdomain like this:

root_url(:subdomain => @subdomain)

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