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我在通過多對多關係與其他模型相關的模型中插入數據。我試圖用加()在許多一對多申請添加值,但不工作,提高此錯誤Cannot set values on a ManyToManyField which specifies an intermediary model.
Django中多對多中介的問題
我閱讀文檔,並發現我們不能對中介模型中使用set(), add(), create()
。
這裏是我的模型:
class Venue(MPTTModel):
organisation = models.ForeignKey(Organisation, verbose_name=_('organisation'))
name = models.CharField(_('name'), max_length=100)
description = models.TextField(_('description'), null=True, blank=True)
address = models.ForeignKey(Address, verbose_name=_('address'))
org_users = models.ManyToManyField(PortalUser, through='OrgMapping', verbose_name=_('org users'))
modified_at = models.DateTimeField(_('modified at'), auto_now=True)
class OrgMapping(models.Model):
host_group = models.ForeignKey(OrgHostGroups, verbose_name=_('host group'))
org_user = models.ForeignKey(PortalUser, verbose_name=_('org user'))
venue = models.ForeignKey(Venue, verbose_name=_('venue'))
org_roles = models.ManyToManyField(OrgRole, verbose_name=_('org roles'))
org_permissions = models.ManyToManyField(OrgPermission, verbose_name=_('org permissions'), blank=True)
created_at = models.DateTimeField(_('created at'), auto_now_add=True)
modified_at = models.DateTimeField(_('modified at'), auto_now=True)
is_deleted = models.BooleanField(_('is deleted'), default=False)
def create_org_venue(org, name, desc, address, org_users):
"""
org_users must be a list or portal users pk's
"""
parent = get_or_none(Venue, organisation__name='TeraMatrix')
venue = Venue(organisation=org,
name=name,
description='Head Office',
address=address)
venue.save()
# save org_users to above venue
for user in org_users:
# venue.org_users.add(user)
venue.org_users = get_or_none(PortalUser,pk=user)
venue.save()
return venue
現在,如果我會嘗試使用create_org_venue
它會提高錯誤會場瞭解創建。任何想法,我怎麼能做到這一點
編輯: -
class OrgHostGroups(MPTTModel):
organisation = models.ForeignKey(Organisation, verbose_name=_('organisation'))
name = models.CharField(_('name'), max_length=100)
description = models.TextField(_('description'), null=True, blank=True)
org_users = models.ManyToManyField(PortalUser, through='OrgMapping', verbose_name=_('org users'))
venues = models.ManyToManyField(Venue, through='OrgMapping', verbose_name=_('venues'))
正如你可以看到場館模型通過映射orgmapping並且還需要orghostgroup並再次需要的場地和映射。所以我們可以說這是一種循環關係。
是的,我發現我需要首先通過映射創建實例。但是我的問題有點複雜。我已編輯我的問題,請你檢查 – saf
對不起,我不確定我瞭解問題。你能不能隨意調用'OrgMapping.objects.create()'多次? – Alasdair