Fix 500 error for Group#web_url method if nested group

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

config/routes/group.rb

@@ -19,13 +19,11 @@ end
 
 scope(path: 'groups/*id',
       controller: :groups,
-      constraints: { id: Gitlab::Regex.namespace_route_regex }) do
+      constraints: { id: Gitlab::Regex.namespace_route_regex, format: /(html|json|atom)/ }) do
   get :edit, as: :edit_group
   get :issues, as: :issues_group
   get :merge_requests, as: :merge_requests_group
   get :projects, as: :projects_group
   get :activity, as: :activity_group
+  get '/', action: :show, as: :group_canonical
 end
-
-# Must be last route in this file
-get 'groups/*id' => 'groups#show', as: :group_canonical, constraints: { id: Gitlab::Regex.namespace_route_regex }

spec/models/group_spec.rb

@@ -269,6 +269,12 @@ describe Group, models: true do
     it 'returns the canonical URL' do
       expect(group.web_url).to include("groups/#{group.name}")
     end
+
+    context 'nested group' do
+      let(:nested_group) { create(:group, :nested) }
+
+      it { expect(nested_group.web_url).to include("groups/#{nested_group.full_path}") }
+    end
   end
 
   describe 'nested group' do