gitlab-org--gitlab-foss/app/services/issuable/destroy_service.rb

module Issuable
  class DestroyService < IssuableBaseService
    def execute(issuable)
      TodoService.new.destroy_target(issuable) do |issuable|
        if issuable.destroy
          issuable.update_project_counter_caches
          issuable.assignees.each(&:invalidate_cache_counts)
        end
      end
    end
  end
end