django.py 文件源码

def create_schedule_abc(user_model=None):
    """Abstract base schedule model factory.

    :param user_model: User model to use as schedule owners.
    :type user_model: :class:`~news.models.AbstractModel`
        implemenatation
    :returns: A abstract base schedule model.
    :rtype: Abstract base django model of
        :class:`~news.models.AbstractSchedule` implementation.

    """
    user_model = user_model or settings.AUTH_USER_MODEL

    class AbstractBaseSchedule(models.Model, AbstractSchedule):
        owner = models.ForeignKey(
            user_model, related_name='schedules',
            db_index=True, blank=True, null=True,
        )

        url = models.URLField()
        cycle = models.IntegerField(default=DEFAULT_SCHEDULE_CYCLE)
        enabled = models.BooleanField(default=False)
        type = models.CharField(max_length=SCHEDULE_TYPE_MAX_LENGTH,
                                default=DEFAULT_SCHEDULE_TYPE)
        options = JSONField(default=DEFAULT_OPTIONS)

        class Meta:
            abstract = True
            unique_together = (('owner', 'url'),)

    return AbstractBaseSchedule