Fix warnings argument memoization in CI/CD stage

app/models/ci/stage.rb

@@ -46,7 +46,11 @@ module Ci
     end
 
     def has_warnings?
-      @warnings ||= statuses.latest.failed_but_allowed.any?
+      if @warnings.nil?
+        statuses.latest.failed_but_allowed.any?
+      else
+        @warnings
+      end
     end
   end
 end

spec/models/ci/stage_spec.rb

@@ -169,20 +169,33 @@ describe Ci::Stage, models: true do
   describe '#has_warnings?' do
     context 'when stage has warnings' do
       context 'when using memoized warnings flag' do
+        context 'when there are warnings' do
           let(:stage) { build(:ci_stage, warnings: true) }
 
-        it 'has warnings' do
+          it 'has memoized warnings' do
+            expect(stage).not_to receive(:statuses)
             expect(stage).to have_warnings
           end
         end
 
+        context 'when there are no warnings' do
+          let(:stage) { build(:ci_stage, warnings: false) }
+
+          it 'has memoized warnings' do
+            expect(stage).not_to receive(:statuses)
+            expect(stage).not_to have_warnings
+          end
+        end
+      end
+
       context 'when calculating warnings from statuses' do
         before do
           create(:ci_build, :failed, :allowed_to_fail,
                  stage: stage_name, pipeline: pipeline)
         end
 
-        it 'has warnings' do
+        it 'has warnings calculated from statuses' do
+          expect(stage).to receive(:statuses).and_call_original
           expect(stage).to have_warnings
         end
       end
@@ -194,7 +207,8 @@ describe Ci::Stage, models: true do
                                     pipeline: pipeline)
       end
 
-      it 'does not have warnings' do
+      it 'does not have warnings calculated from statuses' do
+        expect(stage).to receive(:statuses).and_call_original
         expect(stage).not_to have_warnings
       end
     end