Flush InternalId records after import

After the import has finished, we flush (delete) the InternalId records
related to the project at hand. This means we're starting over with
tracking correct internal id values, a new record will be created
automatically when the next internal id is generated.

The GitHub importer assigns iid values by using supplied values from
GitHub. We skip tracking internal id values during the import in favor
of higher concurrency. Deleting any InternalId records after the import
has finished is an extra measure to guarantee consistency.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/54270.

1 files changed, 11 insertions, 0 deletions

diff --git a/app/models/internal_id.rb b/app/models/internal_id.rb
index 4eb211eff61..e75c6eb2331 100644
--- a/app/models/internal_id.rb
+++ b/app/models/internal_id.rb
@@ -66,6 +66,17 @@ class InternalId < ActiveRecord::Base
       InternalIdGenerator.new(subject, scope, usage, init).generate
     end
 
+    # Flushing records is generally safe in a sense that those
+    # records are going to be re-created when needed.
+    #
+    # A filter condition has to be provided to not accidentally flush
+    # records for all projects.
+    def flush_records!(filter)
+      raise ArgumentError, "filter cannot be empty" if filter.blank?
+
+      where(filter).delete_all
+    end
+
     def available?
       @available_flag ||= ActiveRecord::Migrator.current_version >= REQUIRED_SCHEMA_VERSION # rubocop:disable Gitlab/PredicateMemoization
     end