models.py 文件源码

def from_schedule(cls, schedule):
        spec = {'event': schedule.event,
                'latitude': schedule.lat,
                'longitude': schedule.lon}
        try:
            return cls.objects.get(**spec)
        except cls.DoesNotExist:
            return cls(**spec)
        except MultipleObjectsReturned:
            cls.objects.filter(**spec).delete()
            return cls(**spec)