This post covers it:
http://bitofpixels.com/blog/upgrading-to-mezzanine-4/
On Monday, January 25, 2016 at 3:03:51 PM UTC-5, xBlake wrote:
>
> Hi,
>
> after an upgrade to Cartridge 0.11.0, Mezzanine 4.1.0 and Django 1.8.8 to
> an existing project, migrations have stopped working.
> I'm getting following(like) errors about duplicate columns:
>
>
> *Applying shop.0001_initial... OKApplying
> shop.0002_auto_20141227_1331...Traceback (most recent call last):*
>
> *…django.db.utils.OperationalError: duplicate column name: vat_id*
>
> I've simplified the issue as far as possible to:
>
> in project's settings.py
>
>
>
>
>
>
>
>
> *EXTRA_MODEL_FIELDS = ( (
> 'cartridge.shop.models.ProductVariation.vat', 'ForeignKey',
> ('eshop.VAT',), {'null': True}, ),)*
>
> in eshop app's models.py
>
>
>
>
>
>
>
> *class VAT(models.Model): description = models.CharField(
> _('Description'), blank=False, null=True, unique=True,
> max_length=36) rate = models.DecimalField( _('Rate'),
> blank=False, null=False, decimal_places=3, max_digits=3+6)*
> Both cartridge.shop and eshop migrations were generated anew with
> manage.py makemigrations.
>
> Is this a known issue ?
>
> With Django 1.6 it does work without problems, however this version is no
> longer supported since 04/2015 :(
>
>
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