Use Atom update times of the first event

By simply loading the first event from the already sorted set we save
ourselves extra (slow) queries just to get the latest update timestamp.
This removes the need for Event.latest_update_time and significantly
reduces the time needed to build an Atom feed.

Fixes gitlab-org/gitlab-ce#12415

1 files changed, 0 insertions, 21 deletions

diff --git a/spec/models/event_spec.rb b/spec/models/event_spec.rb
index 071582b0282..ec2a923f91b 100644
--- a/spec/models/event_spec.rb
+++ b/spec/models/event_spec.rb
@@ -65,27 +65,6 @@ describe Event, models: true do
     it { expect(@event.author).to eq(@user) }
   end
 
-  describe '.latest_update_time' do
-    describe 'when events are present' do
-      let(:time) { Time.utc(2015, 1, 1) }
-
-      before do
-        create(:closed_issue_event, updated_at: time)
-        create(:closed_issue_event, updated_at: time + 5)
-      end
-
-      it 'returns the latest update time' do
-        expect(Event.latest_update_time).to eq(time + 5)
-      end
-    end
-
-    describe 'when no events exist' do
-      it 'returns nil' do
-        expect(Event.latest_update_time).to be_nil
-      end
-    end
-  end
-
   describe '.limit_recent' do
     let!(:event1) { create(:closed_issue_event) }
     let!(:event2) { create(:closed_issue_event) }