mcastle mcastle - 1 month ago 12
Python Question

Upgrading to Django 1.7. Getting error: Cannot serialize: <storages.backends.s3boto.S3BotoStorage object

I am trying to upgrade a django app from django 1.6.6 to 1.7 and am using python 2.7.8. When I run

python manage.py makemigrations
, I get the following error:

ValueError: Cannot serialize: <storages.backends.s3boto.S3BotoStorage object at 0x11116eed0>
There are some values Django cannot serialize into migration files.


And here is the relevant code:

protected_storage = storages.backends.s3boto.S3BotoStorage(
acl='private',
querystring_auth=True,
querystring_expire=3600,
)


class Document(models.Model):
...
file = models.FileField(upload_to='media/docs/', max_length=10000, storage=protected_storage)

def __unicode__(self):
return "%s" % self.candidate

def get_absolute_url(self):
return reverse('documents', args=[str(self.pk)])


I've read the migration docs and read about a similar issue here, but I've been unable to resolve this. My app uses django-storages and boto to save files onto Amazon S3. Any help is appreciated.

Answer

Just make a deconstructible subclass and use it instead.

from django.utils.deconstruct import deconstructible


@deconstructible
class MyS3BotoStorage(S3BotoStorage):
    pass
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