docs: def partition(self, ref=None, **kwargs):
          """Return a partition in this bundle for a vid reference or name parts"""
          from ambry.orm.exc import NotFoundError
          from sqlalchemy.orm.exc import NoResultFound
  
          if not ref and not kwargs:
              return None
  
          if ref:
              for p in self.partitions:
                  if ref == p.name or ref == p.vname or ref == p.vid or ref == p.id:
                    p._bundle = self
                    return p
  
              raise NotFoundError("No partition found for '{}' (a)".format(ref))
  
          elif kwargs:
              from ..identity import PartitionNameQuery
              pnq = PartitionNameQuery(**kwargs)
              try:
                  p = self.partitions._find_orm(pnq).one()
                  if p:
                      p._bundle = self
                      return p
              except NoResultFound:
                  raise NotFoundError("No partition found for '{}' (b)".format(kwargs))