gitlab-foss/lib/gitlab/background_migration/delete_orphaned_groups.rb

# frozen_string_literal: true

module Gitlab
  module BackgroundMigration
    class DeleteOrphanedGroups < BatchedMigrationJob
      operation_name :delete_orphaned_group_records
      feature_category :groups_and_projects

      scope_to ->(relation) { relation.where(type: 'Group').where.not(parent_id: nil) }

      def perform
        each_sub_batch do |sub_batch|
          sub_batch
          .joins("LEFT JOIN namespaces AS parent ON namespaces.parent_id = parent.id")
          .where(parent: { id: nil })
          .pluck(:id).each do |orphaned_group_id|
            ::GroupDestroyWorker.perform_async(orphaned_group_id, admin_bot.id)
          end
        end
      end

      private

      def admin_bot
        @_admin_bot ||= Users::Internal.admin_bot
      end
    end
  end
end