Thursday, December 27, 2018

Can I define classes in Django settings, and how can I override such settings in tests?

Hi,

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). I want to define some of our settings as classes. For example:

class UserSettings(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

PASSWORD_VALIDATORS = [
{
'NAME': 'speedy.core.accounts.validators.PasswordMinLengthValidator',
},
{
'NAME': 'speedy.core.accounts.validators.PasswordMaxLengthValidator',
},
]


from django.conf import settings as django_settings

class User(ValidateUserPasswordMixin, PermissionsMixin, Entity, AbstractBaseUser):
settings = django_settings.UserSettings

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

But it throws an exception

AttributeError: 'Settings' object has no attribute 'UserSettings'

(but it doesn't throw an exception if I use there a constant which is not a class).

This is the first problem. In the meantime, I defined instead:

from speedy.net.settings import global_settings as speedy_net_global_settings

class User(ValidateUserPasswordMixin, PermissionsMixin, Entity, AbstractBaseUser):
settings = speedy_net_global_settings.UserSettings

The second problem, is how do I override such settings in tests? For example, I use the following code:

from speedy.core.settings import tests as tests_settings

@override_settings(MAX_NUMBER_OF_FRIENDS_ALLOWED=tests_settings.OVERRIDE_MAX_NUMBER_OF_FRIENDS_ALLOWED)

in https://github.com/speedy-net/speedy-net/blob/uri_merge_with_master_2018-12-26_a/speedy/core/friends/tests/test_views.py. But if `MAX_NUMBER_OF_FRIENDS_ALLOWED` would be defined in the class `UserSettings`, how do I override it?

Thanks,
אורי (Uri)

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