Lordnibbler · October 31, 2021 02:36 · Nov 19, 2013 · Nov 19, 2013 · Nov 19, 2013
diff --git a/integration_spec.rb b/integration_spec.rb
@@ -2,6 +2,8 @@
 
 describe "Something", js: true do
   it "is a fake spec" do
+    # this won't work in CI/test environments
+    # 'another.localhost:3001' is not mapped in /etc/hosts
     visit foo_path(subdomain: 'another')
   end
 end
diff --git a/url_helper.rb b/url_helper.rb
@@ -0,0 +1,15 @@
+module UrlHelper
+  def with_subdomain(subdomain)
+    subdomain = (subdomain || "")
+    subdomain += "." unless subdomain.empty?
+    [subdomain, request.domain].join
+  end
+
+  # allow link_to :subdomain => ""
+  def url_for(options = nil)
+    if options.kind_of?(Hash) && options.has_key?(:subdomain)
+      options[:host] = with_subdomain(options.delete(:subdomain))
+    end
+    super
+  end
+end
diff --git a/domain_constraint.rb b/domain_constraint.rb
@@ -0,0 +1,10 @@
+class DomainConstraint
+  def initialize(domain)
+    @domains = [domain].flatten
+  end
+
+  def matches?(request)
+    request.subdomain.present? ? domain_to_match = request.subdomain + "." + request.domain : domain_to_match = request.domain
+    @domains.include? domain_to_match
+  end
+end
diff --git a/integration_spec.rb b/integration_spec.rb
@@ -0,0 +1,7 @@
+require 'spec_helper'
+
+describe "Something", js: true do
+  it "is a fake spec" do
+    visit foo_path(subdomain: 'another')
+  end
+end
diff --git a/routes.rb b/routes.rb
@@ -0,0 +1,5 @@
+MyApp::Application.routes.draw do
+  constraints DomainConstraint.new(['subdomain.domain.com', 'another.domain.com']) do
+    resources :foo
+  end
+end