docs: def network_exists(project_id, network_name,**kwargs):
      """
      Return a whole network as a complex model.
      """
      try:
          db.DBSession.query(Network.id).filter(func.lower(Network.name).like(network_name.lower()), Network.project_id == project_id).one()
          return 'Y'
      except NoResultFound:
          return 'N'