Django views spawn the error "cleansed = [self.cleanse_setting("", v) for v in value]" and go in infinite loops

Question

I have two views that spawn these messages in sudo systemctl status gunicorn:

gunicorn:

Nov 07 10:46:36 mysite gunicorn[2107]:     cleansed = [self.cleanse_setting("", v) for v in value]
Nov 07 10:46:36 mysite gunicorn[2107]:   File "/home/mysite/anaconda3/envs/mysite/lib/python3.10/site-packages/django/views/debug.py", line 135, in cleanse_setting

The whole site works, but any view.py that accesses a certain class spawn these errors. The views were totally working with no problem.

I added 4 fields to the class's 'models.py' then removed them and migrated the database with:

python manage.py makemigrations
python manage.py migrate

After that, the error started to show.

How can I resolve this?

Did you by any chance have a setting my_setting = []; my_setting.append(my_setting) — willeM_ Van Onsem
– willeM_ Van Onsem, Commented Nov 7 at 11:09
N.B.: opened a ticket for this: code.djangoproject.com/ticket/36716#ticket — willeM_ Van Onsem
– willeM_ Van Onsem, Commented Nov 7 at 11:17
@willeM_VanOnsem thank you so much, the Django version was 5.0.3, I upgraded it to 5.2.8, I also upgraded postgresql from 12 to 14, now the error changed to "Invalid templates library specified". That's why I was late in my response, apologies — Mohammed Baashar
– Mohammed Baashar, Commented Nov 8 at 5:46

Mohammed Baashar · Accepted Answer · 2025-11-09 08:21:58Z

0

The problem was resolved, there was nothing wrong with the 'settings.py', but a database field that conflicted with the previous migrations. Once I filled the field with data, the error stopped and the django site worked fully.

answered Nov 9 at 8:21

Mohammed Baashar

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1 Comment

halfer Nov 9 at 10:39

Thanks for posting your solution. Do you have any test automation around your software? That would likely have caught the errant database field.

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