S3BotoStorage import error on rendervarations

[dporru]

Running the rendervariations command with S3BotoStorage as storage backend gives the following error:

ImportError: Module "django.core.files.storage" does not define a "S3BotoStorage" attribute/class

I'm on django 1.9.2 with django-storages-redux 1.4, python 1.3.5 and the current master of django-stdimage.

On inspection it seems the field.storage object in the render function in stdimage/management/commands/rendervariations.py prints as <storages.backends.s3boto.S3BotoStorage object at 0x102f69550>, but the __module__ is django.core.files.storage.

The class_to_path function returns 'django.core.files.storage.S3BotoStorage' when the actual class is located at 'storages.backends.s3boto.S3BotoStorage'.

Any idea what is going wrong here?

[codingjoe]

Hi @dporru,
I must admit I haven't this one before, but I don't remember actually executing rendervariations on a production Django 1.9 project yet.

This is really odd. Can you post your storage config (without private keys please ;).

Without any deeper inspection, I would point the finger on the lazy loading of the default storage.

[dporru]

Thanks for the quick response! My storage config:

DEFAULT_FILE_STORAGE = 'storages.backends.s3boto.S3BotoStorage'
STATICFILES_STORAGE = 'storages.backends.s3boto.S3BotoStorage'

I think you're correct about the lazy loading of DefaultStorage as a cause. field.storage._wrapped gives back the correct storages.backends.s3boto.S3BotoStorage object.

A naive fix would be to check for the cls._wrapped property in class_to_path and use that in stead of cls when it is present.

[codingjoe]

It's still a curious error. Since the command import the storage anywhere but just forwards it.
Do you have a full stack trace? Where is the error being raised?

[dporru]

Here's the full stack trace. It doesn't contain any secrets 😉
https://gist.github.com/dporru/915d8a448d90b4b08e5b

[codingjoe]

Ok, it seems it is actually this bit that breaks.

[dporru]

Yes exactly.

[codingjoe]

Fix released in 2.2.1

[dporru]

Thanks!