Prevent project team from being truncated too early during project destruction

app/services/projects/destroy_service.rb

@@ -17,8 +17,6 @@ module Projects
     def execute
       return false unless can?(current_user, :remove_project, project)
 
-      project.team.truncate
-
       repo_path = project.path_with_namespace
       wiki_path = repo_path + '.wiki'
 
@@ -30,6 +28,7 @@ module Projects
       Projects::UnlinkForkService.new(project, current_user).execute
 
       Project.transaction do
+        project.team.truncate
         project.destroy!
 
         unless remove_registry_tags

spec/services/projects/destroy_service_spec.rb

@@ -50,6 +50,25 @@ describe Projects::DestroyService, services: true do
     it { expect(Dir.exist?(remove_path)).to be_truthy }
   end
 
+  context 'when flushing caches fail' do
+    before do
+      new_user = create(:user)
+      project.team.add_user(new_user, Gitlab::Access::DEVELOPER)
+      allow_any_instance_of(Projects::DestroyService).to receive(:flush_caches).and_raise(Redis::CannotConnectError)
+    end
+
+    it 'keeps project team intact upon an error' do
+      Sidekiq::Testing.inline! do
+        begin
+          destroy_project(project, user, {})
+        rescue Redis::CannotConnectError
+        end
+      end
+
+      expect(project.team.members.count).to eq 1
+    end
+  end
+
   context 'with async_execute' do
     let(:async) { true }