相关疑难解决方法(0)

当我运行测试时,我在数据库初始化期间遇到此错误:

django.db.migrations.state.InvalidBasesError: Cannot resolve bases for [<ModelState: 'users.GroupProxy'>]
This can happen if you are inheriting models from an app with migrations (e.g. contrib.auth)

我为contrib.auth Group模型创建了这个代理,将它放在django admin的应用程序中:

class GroupProxy(Group):
    class Meta:
        proxy = True
        verbose_name = Group._meta.verbose_name
        verbose_name_plural = Group._meta.verbose_name_plural

那么我该怎么做才能解决这个问题呢？

我正在为模型使用Django 1.7和django-polymorphic

class ReferenceItem(PolymorphicModel):
    created_at = models.DateTimeField(_('date created'), auto_now_add=True, db_index=True)
    updated_at = models.DateTimeField(_('date modified'), auto_now=True, db_index=True)
    uuid = UUIDField(auto=True, unique=True)
    description = models.CharField(max_length=255)

class OrderItem(ReferenceItem):
    order = models.ForeignKey('Order', related_name='items')
    sku = models.CharField(max_length=255)
    quantity = models.IntegerField()
    unit_price = models.DecimalField(max_digits=10, decimal_places=2)
    amount = models.DecimalField(max_digits=10, decimal_places=2)
    tax_rate = models.DecimalField(max_digits=3, decimal_places=2)
    commission_rate = models.DecimalField(max_digits=3, decimal_places=2)

当我运行时makemigrations，出现此错误：

raise InvalidBasesError("Cannot resolve bases for %r\nThis can happen if you are inheriting models from an app with migrations (e.g. contrib.auth)\n in an app with no migrations; …