Not working with Django 4.1

Django has removed de installed property from the Model Options object (_meta). And will produce the following error when using Django Activity Stream

AttributeError: 'Options' object has no attribute 'installed' this comes from actstream/registry.py line 60 (version 1.4.1).

See this commit from Django https://github.com/django/django/commit/8e3b1cf098018b4632de63c359ef6d761e92ec04

[wilson1999112]

For those who also face this before they make django 4.1 release and still want to use django 4.1, maybe this could help:

from django.apps import AppConfig

def is_installed(model_class):
    return model_class._meta.app_config is not None

class MyAppConfig(AppConfig):
    default_auto_field = 'django.db.models.BigAutoField'
    name = 'myapp'
    def ready(self):
        from actstream import registry
        registry.is_installed = is_installed
        registry.register(self.get_model('mymodel'))

[justquick]

i just pushed the change to main branch. going to make a django 4.1 release