Fix 500 error while navigating to the `pages_domains` 'show' page.

==================
= Implementation =
==================

1. The path of the page is of the form 'group/project/pages/domains/<domain_name>'
2. Rails looks at `params[:id]` (which should be the domain name), and finds the
   relevant model record.
3. Given a domain like `foo.bar`, Rails sets `params[:id]` to `foo` (should be
   `foo.bar`), and sets `params[:format]` to `bar`
4. This commit fixes the issue by adding a route constraint, so that
   `params[:id]` is set to the entire `foo.bar` domain name.

=========
= Tests =
=========

1. Add controller specs for the `PagesDomainController`. These are
   slightly orthogonal to this bug fix (they don't fail when this bug is
   present), but should be present nonetheless.
2. Add routing specs that catch this bug (by asserting that the `id`
   param is passed as expected when it contains a domain name).
3. Modify the 'RESTful project resources' routing spec shared example to
   accomodate controllers where the controller path (such as
   `pages/domains`) is different from the controller name (such as
   `pages_domains`).

config/routes/project.rb

@@ -40,7 +40,7 @@ constraints(ProjectUrlConstrainer.new) do
       end
 
       resource :pages, only: [:show, :destroy] do
-        resources :domains, only: [:show, :new, :create, :destroy], controller: 'pages_domains'
+        resources :domains, only: [:show, :new, :create, :destroy], controller: 'pages_domains', constraints: { id: /[^\/]+/ }
       end
 
       resources :compare, only: [:index, :create] do

spec/controllers/projects/pages_domains_controller_spec.rb

@@ -0,0 +1,64 @@
+require 'spec_helper'
+
+describe Projects::PagesDomainsController do
+  let(:user)    { create(:user) }
+  let(:project) { create(:project) }
+
+  let(:request_params) do
+    {
+      namespace_id: project.namespace,
+      project_id: project
+    }
+  end
+
+  before do
+    sign_in(user)
+    project.team << [user, :master]
+  end
+
+  describe 'GET show' do
+    let!(:pages_domain)   { create(:pages_domain, project: project) }
+
+    it "displays the 'show' page" do
+      get(:show, request_params.merge(id: pages_domain.domain))
+
+      expect(response).to have_http_status(200)
+      expect(response).to render_template('show')
+    end
+  end
+
+  describe 'GET new' do
+    it "displays the 'new' page" do
+      get(:new, request_params)
+
+      expect(response).to have_http_status(200)
+      expect(response).to render_template('new')
+    end
+  end
+
+  describe 'POST create' do
+    let(:pages_domain_params) do
+      build(:pages_domain, :with_certificate, :with_key).slice(:key, :certificate, :domain)
+    end
+
+    it "creates a new pages domain" do
+      expect do
+        post(:create, request_params.merge(pages_domain: pages_domain_params))
+      end.to change { PagesDomain.count }.by(1)
+
+      expect(response).to redirect_to(namespace_project_pages_path(project.namespace, project))
+    end
+  end
+
+  describe 'DELETE destroy' do
+    let!(:pages_domain)   { create(:pages_domain, project: project) }
+
+    it "deletes the pages domain" do
+      expect do
+        delete(:destroy, request_params.merge(id: pages_domain.domain))
+      end.to change { PagesDomain.count }.by(-1)
+
+      expect(response).to redirect_to(namespace_project_pages_path(project.namespace, project))
+    end
+  end
+end

spec/routing/project_routing_spec.rb

@@ -27,35 +27,42 @@ describe 'project routing' do
   #     let(:actions)    { [:index] }
   #     let(:controller) { 'issues' }
   #   end
+  #
+  #   # Different controller name and path
+  #   it_behaves_like 'RESTful project resources' do
+  #     let(:controller) { 'pages_domains' }
+  #     let(:controller_path) { 'pages/domains' }
+  #   end
   shared_examples 'RESTful project resources' do
     let(:actions) { [:index, :create, :new, :edit, :show, :update, :destroy] }
+    let(:controller_path) { controller }
 
     it 'to #index' do
-      expect(get("/gitlab/gitlabhq/#{controller}")).to route_to("projects/#{controller}#index", namespace_id: 'gitlab', project_id: 'gitlabhq') if actions.include?(:index)
+      expect(get("/gitlab/gitlabhq/#{controller_path}")).to route_to("projects/#{controller}#index", namespace_id: 'gitlab', project_id: 'gitlabhq') if actions.include?(:index)
     end
 
     it 'to #create' do
-      expect(post("/gitlab/gitlabhq/#{controller}")).to route_to("projects/#{controller}#create", namespace_id: 'gitlab', project_id: 'gitlabhq') if actions.include?(:create)
+      expect(post("/gitlab/gitlabhq/#{controller_path}")).to route_to("projects/#{controller}#create", namespace_id: 'gitlab', project_id: 'gitlabhq') if actions.include?(:create)
     end
 
     it 'to #new' do
-      expect(get("/gitlab/gitlabhq/#{controller}/new")).to route_to("projects/#{controller}#new", namespace_id: 'gitlab', project_id: 'gitlabhq') if actions.include?(:new)
+      expect(get("/gitlab/gitlabhq/#{controller_path}/new")).to route_to("projects/#{controller}#new", namespace_id: 'gitlab', project_id: 'gitlabhq') if actions.include?(:new)
     end
 
     it 'to #edit' do
-      expect(get("/gitlab/gitlabhq/#{controller}/1/edit")).to route_to("projects/#{controller}#edit", namespace_id: 'gitlab', project_id: 'gitlabhq', id: '1') if actions.include?(:edit)
+      expect(get("/gitlab/gitlabhq/#{controller_path}/1/edit")).to route_to("projects/#{controller}#edit", namespace_id: 'gitlab', project_id: 'gitlabhq', id: '1') if actions.include?(:edit)
     end
 
     it 'to #show' do
-      expect(get("/gitlab/gitlabhq/#{controller}/1")).to route_to("projects/#{controller}#show", namespace_id: 'gitlab', project_id: 'gitlabhq', id: '1') if actions.include?(:show)
+      expect(get("/gitlab/gitlabhq/#{controller_path}/1")).to route_to("projects/#{controller}#show", namespace_id: 'gitlab', project_id: 'gitlabhq', id: '1') if actions.include?(:show)
     end
 
     it 'to #update' do
-      expect(put("/gitlab/gitlabhq/#{controller}/1")).to route_to("projects/#{controller}#update", namespace_id: 'gitlab', project_id: 'gitlabhq', id: '1') if actions.include?(:update)
+      expect(put("/gitlab/gitlabhq/#{controller_path}/1")).to route_to("projects/#{controller}#update", namespace_id: 'gitlab', project_id: 'gitlabhq', id: '1') if actions.include?(:update)
     end
 
     it 'to #destroy' do
-      expect(delete("/gitlab/gitlabhq/#{controller}/1")).to route_to("projects/#{controller}#destroy", namespace_id: 'gitlab', project_id: 'gitlabhq', id: '1') if actions.include?(:destroy)
+      expect(delete("/gitlab/gitlabhq/#{controller_path}/1")).to route_to("projects/#{controller}#destroy", namespace_id: 'gitlab', project_id: 'gitlabhq', id: '1') if actions.include?(:destroy)
     end
   end
 
@@ -539,4 +546,20 @@ describe 'project routing' do
         'projects/avatars#destroy', namespace_id: 'gitlab', project_id: 'gitlabhq')
     end
   end
+
+  describe Projects::PagesDomainsController, 'routing' do
+    it_behaves_like 'RESTful project resources' do
+      let(:actions)    { [:show, :new, :create, :destroy] }
+      let(:controller) { 'pages_domains' }
+      let(:controller_path) { 'pages/domains' }
+    end
+
+    it 'to #destroy with a valid domain name' do
+      expect(delete('/gitlab/gitlabhq/pages/domains/my.domain.com')).to route_to('projects/pages_domains#destroy', namespace_id: 'gitlab', project_id: 'gitlabhq', id: 'my.domain.com')
+    end
+
+    it 'to #show with a valid domain' do
+      expect(get('/gitlab/gitlabhq/pages/domains/my.domain.com')).to route_to('projects/pages_domains#show', namespace_id: 'gitlab', project_id: 'gitlabhq', id: 'my.domain.com')
+    end
+  end
 end