Clear cached markdown after renaming projects

lib/gitlab/database/rename_reserved_paths_migration/rename_base.rb

@@ -90,6 +90,24 @@ module Gitlab
           FileUtils.mv(old_path, new_path)
         end
 
+        def remove_cached_html_for_projects(project_ids)
+          update_column_in_batches(:projects, :description_html, nil) do |table, query|
+            query.where(table[:id].in(project_ids))
+          end
+
+          update_column_in_batches(:issues, :description_html, nil) do |table, query|
+            query.where(table[:project_id].in(project_ids))
+          end
+
+          update_column_in_batches(:merge_requests, :description_html, nil) do |table, query|
+            query.where(table[:target_project_id].in(project_ids))
+          end
+
+          update_column_in_batches(:notes, :note_html, nil) do |table, query|
+            query.where(table[:project_id].in(project_ids))
+          end
+        end
+
         def file_storage?
           CarrierWave::Uploader::Base.storage == CarrierWave::Storage::File
         end

lib/gitlab/database/rename_reserved_paths_migration/rename_namespaces.rb

@@ -27,6 +27,7 @@ module Gitlab
           move_repositories(namespace, old_full_path, new_full_path)
           move_uploads(old_full_path, new_full_path)
           move_pages(old_full_path, new_full_path)
+          remove_cached_html_for_projects(projects_for_namespace(namespace).map(&:id))
         end
 
         def move_repositories(namespace, old_full_path, new_full_path)
@@ -55,8 +56,6 @@ module Gitlab
           MigrationClasses::Project.where(namespace_or_children)
         end
 
-        # This won't scale to huge trees, but it should do for a handful of
-        # namespaces called `system`.
         def child_ids_for_parent(namespace, ids: [])
           namespace.children.each do |child|
             ids << child.id

lib/gitlab/database/rename_reserved_paths_migration/rename_projects.rb

@@ -8,6 +8,8 @@ module Gitlab
           projects_for_paths.each do |project|
             rename_project(project)
           end
+
+          remove_cached_html_for_projects(projects_for_paths.map(&:id))
         end
 
         def rename_project(project)
@@ -28,10 +30,12 @@ module Gitlab
         end
 
         def projects_for_paths
+          return @projects_for_paths if @projects_for_paths
+
           with_paths = MigrationClasses::Route.arel_table[:path]
                          .matches_any(path_patterns)
 
-          MigrationClasses::Project.joins(:route).where(with_paths)
+          @projects_for_paths = MigrationClasses::Project.joins(:route).where(with_paths)
         end
       end
     end

spec/lib/gitlab/database/rename_reserved_paths_migration/rename_base_spec.rb

@@ -27,6 +27,46 @@ describe Gitlab::Database::RenameReservedPathsMigration::RenameBase do
     end
   end
 
+  describe '#remove_cached_html_for_projects' do
+    let(:project) { create(:empty_project, description_html: 'Project description') }
+
+    it 'removes description_html from projects' do
+      subject.remove_cached_html_for_projects([project.id])
+
+      expect(project.reload.description_html).to be_nil
+    end
+
+    it 'removes issue descriptions' do
+      issue = create(:issue, project: project, description_html: 'Issue description')
+
+      subject.remove_cached_html_for_projects([project.id])
+
+      expect(issue.reload.description_html).to be_nil
+    end
+
+    it 'removes merge request descriptions' do
+      merge_request = create(:merge_request,
+                             source_project: project,
+                             target_project: project,
+                             description_html: 'MergeRequest description')
+
+      subject.remove_cached_html_for_projects([project.id])
+
+      expect(merge_request.reload.description_html).to be_nil
+    end
+
+    it 'removes note html' do
+      note = create(:note,
+                    project: project,
+                    noteable: create(:issue, project: project),
+                    note_html: 'note description')
+
+      subject.remove_cached_html_for_projects([project.id])
+
+      expect(note.reload.note_html).to be_nil
+    end
+  end
+
   describe '#rename_path_for_routable' do
     context 'for namespaces' do
       let(:namespace) { create(:namespace, path: 'the-path') }

spec/lib/gitlab/database/rename_reserved_paths_migration/rename_namespaces_spec.rb

@@ -139,7 +139,13 @@ describe Gitlab::Database::RenameReservedPathsMigration::RenameNamespaces do
       subject.rename_namespace(namespace)
     end
 
-    it 'invalidates the markdown cache of related projects'
+    it 'invalidates the markdown cache of related projects' do
+      project = create(:empty_project, namespace: namespace, path: "the-path-project")
+
+      expect(subject).to receive(:remove_cached_html_for_projects).with([project.id])
+
+      subject.rename_namespace(namespace)
+    end
   end
 
   describe '#rename_namespaces' do

spec/lib/gitlab/database/rename_reserved_paths_migration/rename_projects_spec.rb

@@ -29,6 +29,23 @@ describe Gitlab::Database::RenameReservedPathsMigration::RenameProjects do
     end
   end
 
+  describe '#rename_projects' do
+    let!(:projects) { create_list(:empty_project, 2, path: 'the-path') }
+
+    it 'renames each project' do
+      expect(subject).to receive(:rename_project).twice
+
+      subject.rename_projects
+    end
+
+    it 'invalidates the markdown cache of related projects' do
+      expect(subject).to receive(:remove_cached_html_for_projects).
+                           with(projects.map(&:id))
+
+      subject.rename_projects
+    end
+  end
+
   describe '#rename_project' do
     let(:project) do
       create(:empty_project,
@@ -68,8 +85,6 @@ describe Gitlab::Database::RenameReservedPathsMigration::RenameProjects do
 
       subject.rename_project(project)
     end
-
-    it 'invalidates the markdown cache of related projects'
   end
 
   describe '#move_repository' do