new_contents: from django.core.management.base import BaseCommand
  
  from waldur_core.core.models import User
  from waldur_mastermind.marketplace.models import Order, OrderItem, Resource
  
  
  class Command(BaseCommand):
      help = """Create marketplace order for each resource if it does not yet exist."""
  
      def handle(self, *args, **options):
          default_user = User.objects.filter(is_staff=True).first()
          existing_resources = OrderItem.objects.exclude(resource_id=None)\
              .values_list('resource_id', flat=True).distinct()
          missing_resources = Resource.objects.exclude(id__in=existing_resources)
          for resource in missing_resources:
              order = Order.objects.create(
                  created=resource.created,
                  modified=resource.modified,
                  created_by=default_user,
                  approved_by=default_user,
                  approved_at=resource.created,
                  project=resource.project,
                  state=Order.States.DONE,
              )
              OrderItem.objects.create(
                  order=order,
                  resource=resource,
                  offering=resource.offering,
                  attributes=resource.attributes,
                  limits=resource.limits,
                  plan=resource.plan,
                  state=OrderItem.States.DONE,
              )
          count = missing_resources.count()
          if count == 0:
              self.stdout.write(self.style.SUCCESS('There are no resources without orders.'))
          if count == 1:
              self.stdout.write(self.style.SUCCESS('%s order has been created.' % count))
          else:
              self.stdout.write(self.style.SUCCESS('%s orders have been created.' % count))
  
subject: Implement management command to import orders for existing resources.