Drop legacy finished at in Deployment

This commit drops the legacy finished at calculation
of deployments.

Changelog: fixed

app/models/deployment.rb

@@ -294,10 +294,6 @@ def stop_action
     @stop_action ||= manual_actions.find { |action| action.name == self.on_stop }
   end
-  def finished_at
-    read_attribute(:finished_at) || legacy_finished_at
-  end
-
   def deployed_at
     return unless success?
@@ -405,10 +401,6 @@ def update_status!(status)
       raise ArgumentError, "The status #{status.inspect} is invalid"
     end
   end
-
-  def legacy_finished_at
-    self.created_at if success? && !read_attribute(:finished_at)
-  end
 end
 Deployment.prepend_mod_with('Deployment')

spec/features/projects/environments/environment_spec.rb

@@ -132,6 +132,29 @@ def auto_stop_button_selector
         end
       end
+      context 'with upcoming deployments' do
+        let(:pipeline) { create(:ci_pipeline, project: project) }
+        let(:build) { create(:ci_build, pipeline: pipeline) }
+
+        let!(:runnind_deployment_1) { create(:deployment, environment: environment, deployable: build, status: :running) }
+        let!(:runnind_deployment_2) { create(:deployment, environment: environment, deployable: build, status: :running) }
+        # Success deployments must have present `finished_at`. We'll backfill in the future.
+        # See https://gitlab.com/gitlab-org/gitlab/-/issues/350618 for more information.
+        let!(:success_without_finished_at) { create(:deployment, environment: environment, deployable: build, status: :success, finished_at: nil) }
+
+        before do
+          visit_environment(environment)
+        end
+
+        # This ordering is unexpected and to be fixed.
+        # See https://gitlab.com/gitlab-org/gitlab/-/issues/350618 for more information.
+        it 'shows upcoming deployments in unordered way' do
+          displayed_ids = find_all('[data-testid="deployment-id"]').map { |e| e.text }
+          internal_ids = [runnind_deployment_1, runnind_deployment_2, success_without_finished_at].map { |d| "##{d.iid}" }
+          expect(displayed_ids).to match_array(internal_ids)
+        end
+      end
+
       context 'with related deployable present' do
         let(:pipeline) { create(:ci_pipeline, project: project) }
         let(:build) { create(:ci_build, pipeline: pipeline) }

spec/models/deployment_spec.rb

@@ -369,38 +369,6 @@
     end
   end
-  describe '#finished_at' do
-    subject { deployment.finished_at }
-
-    context 'when deployment status is created' do
-      let(:deployment) { create(:deployment) }
-
-      it { is_expected.to be_nil }
-    end
-
-    context 'when deployment status is success' do
-      let(:deployment) { create(:deployment, :success) }
-
-      it { is_expected.to eq(deployment.read_attribute(:finished_at)) }
-    end
-
-    context 'when deployment status is success' do
-      let(:deployment) { create(:deployment, :success, finished_at: nil) }
-
-      before do
-        deployment.update_column(:finished_at, nil)
-      end
-
-      it { is_expected.to eq(deployment.read_attribute(:created_at)) }
-    end
-
-    context 'when deployment status is running' do
-      let(:deployment) { create(:deployment, :running) }
-
-      it { is_expected.to be_nil }
-    end
-  end
-
   describe '#deployed_at' do
     subject { deployment.deployed_at }