An error has occurred with Django compress: Input of type 'CacheKey' is invalid

We encountered a new problem when trying to compress Django static files on our production servers. Our setup includes Ubuntu 16.04, Python 3.x, and Django 1.11. I am using an ansible-playbook for deployment.

The specific error message we are seeing is:

CommandError: An error occurred during rendering /chalktalk/app/chalktalk-react-40/chalktalk-react-40/chalktalk/apps/exams/templates/exams/section-edit.html: Invalid input of type: 'CacheKey'. Convert to a byte, string, or number first.

This issue doesn't appear to be isolated to one particular static file but seems to be affecting multiple files consistently. Each time we try to run the compression process, a different file triggers the error.

I have tried searching for solutions online, but so far I haven't been able to find any references to the same error message.

pythondjangoansibledjango-compressor

Answer №1

There is a change in the redis library between versions 2 and 3. To resolve this issue, consider specifying your redis version as 2.10.6, which was released on August 17, 2017, before the change occurred.

pip install redis==2.10.6
# and/or
echo redis==2.10.6 >> requirements.txt

If you are unsure about which package requires redis as a dependency or if you are using it yourself, the process remains the same.

In my situation, this problem arose from the django-redis package, which relies on the underlying redis package. Since Django-redis does not set a restriction on the maximum version, it can unintentionally upgrade beyond a major version change that may impact the API.

The actual code (in my case) can be found in master branch at django-redis:

install_requires = [
    "redis>=2.10.0",
]

However, it would be more appropriate to specify:

install_requires = [
    "redis>=2.10.0, <3",
]

Update: I just came across the bug report in django-redis (#342) regarding this issue, although this Stack Overflow question appeared first on Google during my investigations.

Answer №2

To resolve the issue, consider installing an earlier version of redis-py.

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