Fix Error 500 due to stale cache when projects are renamed or transferred

Closes gitlab-org/gitlab-ee#506

CHANGELOG

@@ -8,6 +8,7 @@ v 8.7.1 (unreleased)
   - Fix license detection to detect all license files, not only known licenses. !3878
   - Use the `can?` helper instead of `current_user.can?`. !3882
   - Prevent users from deleting Webhooks via API they do not own
+  - Fix Error 500 due to stale cache when projects are renamed or transferred
 
 v 8.7.0
   - Gitlab::GitAccess and Gitlab::GitAccessWiki are now instrumented

app/models/project.rb

@@ -820,13 +820,11 @@ class Project < ActiveRecord::Base
     wiki = Repository.new("#{old_path}.wiki", self)
 
     if repo.exists?
-      repo.expire_cache
-      repo.expire_emptiness_caches
+      repo.before_delete
     end
 
     if wiki.exists?
-      wiki.expire_cache
-      wiki.expire_emptiness_caches
+      wiki.before_delete
     end
   end
 

app/services/projects/transfer_service.rb

@@ -34,6 +34,8 @@ module Projects
           raise TransferError.new("Project with same path in target namespace already exists")
         end
 
+        project.expire_caches_before_rename(old_path)
+
         # Apply new namespace id and visibility level
         project.namespace = new_namespace
         project.visibility_level = new_namespace.visibility_level unless project.visibility_level_allowed_by_group?

spec/models/project_spec.rb

@@ -719,11 +719,8 @@ describe Project, models: true do
         with('foo.wiki', project).
         and_return(wiki)
 
-      expect(repo).to receive(:expire_cache)
-      expect(repo).to receive(:expire_emptiness_caches)
-
-      expect(wiki).to receive(:expire_cache)
-      expect(wiki).to receive(:expire_emptiness_caches)
+      expect(repo).to receive(:before_delete)
+      expect(wiki).to receive(:before_delete)
 
       project.expire_caches_before_rename('foo')
     end