code: async def delete_object(obj, recursive=False, delete_nullable=False):
      
      warnings.warn("delete_object() is deprecated, Manager.delete() "
                    "should be used instead",
                    DeprecationWarning)
  
      # Here are private calls involved:
      # - obj._pk_expr()
      if recursive:
          dependencies = obj.dependencies(delete_nullable)
          for query, fk in reversed(list(dependencies)):
              model = fk.model
              if fk.null and not delete_nullable:
                  await update(model.update(**{fk.name: None}).where(query))
              else:
                  await delete(model.delete().where(query))
      result = await delete(obj.delete().where(obj._pk_expr()))
      return result
docs: Delete object asynchronously.
  
      :param obj: object to delete
      :param recursive: if ``True`` also delete all other objects depends on
          object
      :param delete_nullable: if `True` and delete is recursive then delete even
          'nullable' dependencies
  
      For details please check out `Model.delete_instance()`_ in peewee docs.
  
      .. _Model.delete_instance(): http://peewee.readthedocs.io/en/latest/peewee/
          api.html#Model.delete_instance