django_orm.py 文件源码

def locked_get(self):
    """Retrieve Credential from datastore.

    Returns:
      oauth2client.Credentials
    """
    credential = None

    query = {self.key_name: self.key_value}
    entities = self.model_class.objects.filter(**query)
    if len(entities) > 0:
      credential = getattr(entities[0], self.property_name)
      if credential and hasattr(credential, 'set_store'):
        credential.set_store(self)
    return credential