Question

我有一个模型通过OneToOneField引用另一个模型，因此当您使用Django的内置delete_selected管理操作时，相关模型的数据不会被删除。我想编写一个自定义管理操作来删除该关联模型中的数据。

这是我的模特：

class Party(models.Model):
    TYPE_CHOICES=(
        ('P','Person'),
        ('O','Organization')
    )
    partyType = models.CharField(max_length=1, choices=TYPE_CHOICES)
    name = models.CharField(max_length=100)
    comment = models.CharField(max_length=500,blank=True)
    accessIdCrossRef=models.IntegerField(blank=True, null=True)
    mailingLists = models.ManyToManyField(MailingList)
    inMainList=models.BooleanField(default=False)
    inSubList=models.BooleanField(default=False)

    class Meta:
        db_table='party'
        ordering=['name',]

    def __unicode__(self):
        return self.name

class Person(models.Model):
    party = models.OneToOneField(Party, editable=False)
    firstName=models.CharField(max_length=60)
    lastName=models.CharField(max_length=60)
    ...


    def save(self):
        if None == self.party :
            print 'Creating party for person'
            p = Party()
            p.partyType = 'P'
            p.save()
            self.party = p

        # Get address to set party name used in list
        city=""
        state=""
        postalCode=""
        try:
            partyAddress = PartyPostalAddress.objects.get(party=self.party)
            address = partyAddress.postalAddress
            city=address.city
            state=address.state
            postalCode=address.postalCode
        except PartyPostalAddress.DoesNotExist:
            pass

        self.party.name = '%s, %s - %s, %s %s' %(self.lastName, self.firstName, city, state, postalCode)
        self.party.save()
        super(Person,self).save()

我的假设是在我的模型中写一个def delete()，如下所示：

def delete(self):
    self.party.delete()
    self.delete()

这样的管理员行动：

class PersonAdmin(admin.ModelAdmin):
    list_display = ('lastName','firstName')
    search_fields = ('firstName', 'lastName')
        actions=['really_delete_selected']

    def get_actions(self, request):
    actions = super(PersonAdmin, self).get_actions(request)
    del actions['delete_selected']
    return actions

    def really_delete_selected(self, request, queryset):
    for obj in queryset:
        obj.delete()

    if queryset.count() == 1:
        message_bit = "1 person was"
    else:
        message_bit = "%s people were" % queryset.count()
    self.message_user(request, "%s successfully deleted." % message_bit)
    really_delete_selected.short_description = "Delete selected entries"

删除person.party和大多数人，但因为人的一方OneToOneField现在为空而抛出错误。具体错误是：

“/ admin / common / person /”中的AssertionError 无法删除Party对象，因为其id属性设置为None。“

有什么想法吗？ This，this和this问题是相关的，但只有其中一个使用OneToOneField并且他错误地执行了此操作。

Answer 1

我感觉它应该像切换删除两者的顺序一样简单（除非你已经尝试过这个）。由于此人与聚会相关联，因此一旦删除了人，您就无法访问聚会。因此你应该做

person.party.delete()
person.delete()

Answer 2

清理干净并正常工作！

我的模特：

class Party(models.Model):
    name = models.CharField(max_length=100)
    ...

class Person(models.Model):
    party = models.OneToOneField(Party, editable=False)
    firstName=models.CharField(max_length=60)
    lastName=models.CharField(max_length=60)

    def delete(self):
        d = self.party.id
        Party.objects.get(id__exact=d).delete()

我的管理员：

class PersonAdmin(admin.ModelAdmin):
    actions=['really_delete_selected']

    def get_actions(self, request):
        actions = super(PersonAdmin, self).get_actions(request)
        del actions['delete_selected']
        return actions

    def really_delete_selected(self, request, queryset):
        for obj in queryset:
            obj.delete()

        if queryset.count() == 1:
            message_bit = "1 person was"
        else:
            message_bit = "%s people were" % queryset.count()

        self.message_user(request, "%s successfully deleted." % message_bit)
        really_delete_selected.short_description = "Delete selected entries"
        ...

从admin中删除关联的OneToOneField模型中的SQL数据

2 个答案: