Overriding settings in Django when used by the models

https://stackoverflow.com/questions/53953444/overriding-settings-in-django-when-used-by-the-models

We are using Django for Speedy Net and Speedy Match (currently Django 1.11.17, we can't upgrade to a newer version of Django because of one of our requirements, django-modeltranslation). Some of our settings are used by the models. For example:

class USER_SETTINGS(object):      MIN_USERNAME_LENGTH = 6      MAX_USERNAME_LENGTH = 40        MIN_SLUG_LENGTH = 6      MAX_SLUG_LENGTH = 200        # Users can register from age 0 to 180, but can't be kept on the site after age 250.      MIN_AGE_ALLOWED_IN_MODEL = 0  # In years.      MAX_AGE_ALLOWED_IN_MODEL = 250  # In years.        MIN_AGE_ALLOWED_IN_FORMS = 0  # In years.      MAX_AGE_ALLOWED_IN_FORMS = 180  # In years.        MIN_PASSWORD_LENGTH = 8      MAX_PASSWORD_LENGTH = 120        MAX_NUMBER_OF_FRIENDS_ALLOWED = 800        PASSWORD_VALIDATORS = [          {              'NAME': 'speedy.core.accounts.validators.PasswordMinLengthValidator',          },          {              'NAME': 'speedy.core.accounts.validators.PasswordMaxLengthValidator',          },      ]

(which is defined in https://github.com/speedy-net/speedy-net/blob/uri_merge_with_master_2018-12-26_a/speedy/net/settings/global_settings.py). And then in the models I use:

from django.conf import settings as django_settings    class User(ValidateUserPasswordMixin, PermissionsMixin, Entity, AbstractBaseUser):      settings = django_settings.USER_SETTINGS

(and then use attributes of settings, such as settings.MIN_SLUG_LENGTH, in the class).

The problem is, when I try to override such settings in tests (you can see my question & answer on Can I define classes in Django settings, and how can I override such settings in tests?), User.settings remains the same and is not overridden by the settings I tried to override. This is a problem since in the model I passed settings.MIN_SLUG_LENGTH for example to validators, which are also passed other values by other models. Is it possible to define the models and settings in such a way which the correct settings will be used both in production and in tests, including when I want to override them?

I'm aware of this quote from https://docs.djangoproject.com/en/dev/topics/testing/tools/#overriding-settings:

Warning

The settings file contains some settings that are only consulted during initialization of Django internals. If you change them with override_settings, the setting is changed if you access it via the django.conf.settings module, however, Django's internals access it differently. Effectively, using override_settings() or modify_settings() with these settings is probably not going to do what you expect it to do.

We do not recommend altering the DATABASES setting. Altering the CACHES setting is possible, but a bit tricky if you are using internals that make using of caching, like django.contrib.sessions. For example, you will have to reinitialize the session backend in a test that uses cached sessions and overrides CACHES.

Finally, avoid aliasing your settings as module-level constants as override_settings() won't work on such values since they are only evaluated the first time the module is imported.

Which I understand are relevant in this case, but how do I define the settings in such a way that I can override them?

Thanks,

אורי (Uri)

uri@speedy.net

אורי

uri@speedy.net

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