Subdomainify

Subdomainify is a subdomain rewriting middleware for your Rails 4 app.

In a Rails 4 app, add this to your Gemfile and run the bundle command:

gem "subdomainify"

Simply mark any route in your routes.rb with subdomainify: true. For example:

resources :blogs, subdomainify: true do
  resources :articles
  resources :comments
end

After marking a resource with subdomainify, a url_for call to that resource will automatically generate a subdomain route instead of a normal route. For example:

@blog             # => #<Blog id: 1, user_id: 1, name: "My Example Blog", slug: "foo">
@blog.to_param    # => "foo"
blog_url(@blog)   # => "http://foo.example.com/"
blog_path(@blog)  # => "http://foo.example.com/"

This also works for nested resources:

@article                            # => #<Article id: 1, user_id: 1, title: "Lorem ipsum", slug: "lorem-ipsum", body: "Dolor sit amet">
@article.to_param                   # => "lorem-ipsum"
blog_article_url(@blog, @article)   # => "http://foo.example.com/articles/lorem-ipsum"
blog_article_path(@blog, @article)  # => "http://foo.example.com/articles/lorem-ipsum"

Subdomainify works by rewriting a subdomain URL to the specific route using a Rack middleware. In the above example, the resource URL for the blogs resource is located at example.com/blogs/:id. When users visit foo.example.com, Subdomainify will rewrite that request into example.com/blogs/foo. This includes everything else that was passed in as the path. For example, when users visit this URL:

http://foo.example.com/articles/hello-world

The middleware will rewrite PATH_INFO into:

http://foo.example.com/blogs/foo/articles/hello-world

Which means on the application side, you can treat subdomain routes like any other routes. Please note that even after rewriting, the subdomain is not discarded, allowing for its usage in constraints:

constraints ->(req) { req.subdomain.present? } do
  resources :blogs, subdomainify: true do
    resources :articles
    resources :comments
  end
end

Doing so will make this route accessible only when visited from subdomain URL.

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