from_db_value() missing 1 required positional argument: 'context'

[diegoduncan21]

Describe the problem

Im using DB backend(mysql:5.7.22).

I see this error in the django admin in the constance section.

TypeError at /admin/constance/config/
from_db_value() missing 1 required positional argument: 'context'

Steps to reproduce

First I see all the constants in the admin with the default values setted, I see in the DB and there is no data in the constance_config table. Until here is all normal I think that is the default behavior.

Second I press save without modify any constant and all the constants are saved in the DB, after this action I can't see the admin again and this error is raised:

TypeError at /admin/constance/config/
from_db_value() missing 1 required positional argument: 'context'

System configuration

• Django version: 3.1.4
• Python version: 3.8
• Django-Constance version: 2.8.0

[blw0rm]

Confirming the same issue for DB backend with PostgreSQL 13.2.

[blw0rm]

Actually, the problem only appears with django-picklefield versions prior to 2.0 after which the "context" argument was removed from the from_db_value field method. This ensures compatibility with Django 2.0 and upper versions.
So the solution is to upgrade django-picklefield 2.0 and higher.

[diegoduncan21]

Actually, the problem only appears with django-picklefield versions prior to 2.0 after which the "context" argument was removed from the from_db_value field method. This ensures compatibility with Django 2.0 and upper versions.
So the solution is to upgrade django-picklefield 2.0 and higher.

totally, I upgrade django-picklefield to the last version and it works! thanks!