user.py 文件源码

def remove_preferences(user, updated_preferences, subscription_key):
    """
    Parameters
    ----------
    user - ndb.User
    preferences - {SubscriptionDateTime.key:Boolean}
    subscription_key - ndb.Key

    Returns
    -------
    set(SubscriptionDateTime.Key)

    """
    removed = set()
    for preference in ndb.get_multi(user.subscription_preferences):
        if preference.subscription == subscription_key:
            if not updated_preferences.get(preference.preference, True):
                index = user.subscription_preferences.index(preference.key)
                removed.add(user.subscription_preferences[index])
                del user.subscription_preferences[index]
                user.put()

    for record in removed:
        record.delete()

    return removed