我正在尝试为我的模型创建一个新对象,但是继续为一个字段获取值none。你知道吗
我的模型是这样的:
class KeyCategory(models.Model):
program = models.ForeignKey('Program', verbose_name='Programm', on_delete=models.CASCADE)
name = models.CharField('Name', max_length=100)
events = models.ManyToManyField('Event', through='EventQuota')
class Meta:
verbose_name = 'Category'
verbose_name_plural = 'Categories'
ordering = ['name']
unique_together = ("program", "name")
permissions = (
('view_key_category', 'Have access to categories'),
)
class EventQuota(models.Model):
key_category = models.ForeignKey(KeyCategory, on_delete=models.CASCADE, related_name='key_quota')
event = models.ForeignKey('Event', on_delete=models.CASCADE, related_name='key_quota')
quota = models.PositiveIntegerField('Quota', default=0)
class Meta:
verbose_name = 'Quota'
verbose_name_plural = 'Quotas'
unique_together = ('key_category', 'event')
当我现在尝试创建KeyCategory和EventQuota时,KeyCategory的字段“events”总是返回core.Event.None
if program.pk == 1:
for _ in range(0, 2):
key_category = KeyCategory(
program=program,
name=random.choice(self.eventList)
)
key_category.save()
event_quota = EventQuota(
key_category=key_category,
event = random.choice(eventList),
quota = random.randint(0,100)
)
event_quota.save()
注意:random.choice
中的eventList
是对象的查询集列表。你知道吗
我试着以DjangosExtra fields on Many-to-Many relationships为例,但不知怎么的,我似乎遗漏了一些东西,或者做了一些不正确的事情?如果有任何帮助,我将不胜感激!谢谢你的关心。你知道吗
日志记录:
import logging
logger = logging.getLogger(__name__)
logger.debug(key_category.events)
当您访问密钥时_类别.事件您要求的是字段的值(或外键字段的单个对象)。但是,对于manytomy关系,您需要多个对象(queryset)。 使用密钥_category.events.all类别()返回与键类别相关的对象,而不仅仅是单个值。你知道吗
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