Fix atom feed with push events for multiple tags

When the push event is for multiple tags, we cannot generate a link
because we don't store the tags / refs.

Changelog: fixed
MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/62059

app/helpers/events_helper.rb

@@ -157,7 +157,7 @@ module EventsHelper
         project_commit_url(event.project,
                                      id: event.commit_to)
       end
-    else
+    elsif event.ref_name
       project_commits_url(event.project,
                                     event.ref_name)
     end

app/views/events/_event.atom.builder

@@ -3,10 +3,11 @@
 return unless event.visible_to_user?(current_user)
 
 event = event.present
+event_url = event_feed_url(event)
 
 xml.entry do
   xml.id      "tag:#{request.host},#{event.created_at.strftime("%Y-%m-%d")}:#{event.id}"
-  xml.link    href: event_feed_url(event)
+  xml.link    href: event_url if event_url
   xml.title   truncate(event_feed_title(event), length: 80)
   xml.updated event.updated_at.xmlschema
 

app/views/events/_event_push.atom.haml

+- event_url = event_feed_url(event)
+
 %div{ xmlns: "http://www.w3.org/1999/xhtml" }
   %p
     %strong= event.author_name
-    = link_to "(#{truncate_sha(event.commit_id)})", event_feed_url(event)
+    = link_to "(#{truncate_sha(event.commit_id)})", event_url if event_url
     %i
       at
       = event.created_at.to_s(:short)

changelogs/unreleased/fix-push-multiple-tags-atom.yml

+---
+title: Fix atom feed with push events for multiple tags
+merge_request: 62059
+author:
+type: fixed

spec/controllers/dashboard/projects_controller_spec.rb

@@ -156,6 +156,12 @@ RSpec.describe Dashboard::ProjectsController, :aggregate_failures do
         let!(:design_event) { create(:design_event, project: project) }
         let!(:wiki_page_event) { create(:wiki_page_event, project: project) }
         let!(:issue_event) { create(:closed_issue_event, project: project) }
+        let!(:push_event) do
+          create(:push_event, project: project).tap do |event|
+            create(:push_event_payload, event: event, ref_count: 2, ref: nil, ref_type: :tag, commit_count: 0, action: :pushed)
+          end
+        end
+
         let(:design) { design_event.design }
         let(:wiki_page) { wiki_page_event.wiki_page }
         let(:issue) { issue_event.issue }
@@ -168,9 +174,10 @@ RSpec.describe Dashboard::ProjectsController, :aggregate_failures do
         it 'renders all kinds of event without error' do
           get :index, format: :atom
 
-          expect(assigns(:events)).to include(design_event, wiki_page_event, issue_event)
+          expect(assigns(:events)).to include(design_event, wiki_page_event, issue_event, push_event)
           expect(response).to render_template('dashboard/projects/index')
           expect(response.body).to include(
+            "pushed to project",
             "uploaded design #{design.to_reference}",
             "created wiki page #{wiki_page.title}",
             "joined project #{project.full_name}",

spec/helpers/events_helper_spec.rb

@@ -88,6 +88,13 @@ RSpec.describe EventsHelper do
 
       expect(helper.event_feed_url(event)).to eq(push_event_feed_url(event))
     end
+
+    it 'returns nil for push event with multiple refs' do
+      event = create(:push_event)
+      create(:push_event_payload, event: event, ref_count: 2, ref: nil, ref_type: :tag, commit_count: 0, action: :pushed)
+
+      expect(helper.event_feed_url(event)).to eq(nil)
+    end
   end
 
   describe '#event_preposition' do