ValueError with multi-table inheritance in Django Admin
- by jorde
I created two new classes which inherit model Entry:
class Entry(models.Model):
LANGUAGE_CHOICES = settings.LANGUAGES
language = models.CharField(max_length=2, verbose_name=_('Comment language'), choices=LANGUAGE_CHOICES)
user = models.ForeignKey(User)
country = models.ForeignKey(Country, null=True, blank=True)
created = models.DateTimeField(auto_now=True)
class Comment(Entry):
comment = models.CharField(max_length=2000, blank=True, verbose_name=_('Comment in English'))
class Discount(Entry):
discount = models.CharField(max_length=2000, blank=True, verbose_name=_('Comment in English'))
coupon = models.CharField(max_length=2000, blank=True, verbose_name=_('Coupon code if needed'))
After adding these new models to admin via admin.site.register I'm getting ValueError when trying to create a comment or a discount via admin. Adding entries works fine.
Error msg:
ValueError at /admin/reviews/discount/add/
Cannot assign "''": "Discount.discount" must be a "Discount" instance.
Request Method: GET
Request URL: http://127.0.0.1:8000/admin/reviews/discount/add/
Exception Type: ValueError
Exception Value:
Cannot assign "''": "Discount.discount" must be a "Discount" instance.
Exception Location: /Library/Python/2.6/site-packages/django/db/models/fields/related.py in set, line 211
Python Executable: /usr/bin/python
Python Version: 2.6.1
