Constance CLI does not work properly without django admin

[Alirezaja1384]

Describe the problem

It seems disabling django admin's app breaks the constance CLI. As I noticed constance/management/commands/constance.py imports ConstanceForm and get_values from admin configuration. The problem is admin.py tries to register the constance's config class and since the admin app is not present in INSTALLED_APPS django throws a LookupError.

I think splitting ConstanceForm and get_values to a separate module (like forms.py) and importing them directly from that module can easily fix the problem.

Steps to reproduce

1. Remove django.contrib.admin from INSTALLED_APPS (And its URL pattern)
2. Run python manage.py constance --help

System configuration

• Django version: 4.0.7
• Python version: 3.10.7
• Django-Constance version: 2.9.1

[syre]

I am running into the same thing, this is the error we are getting when trying to run python manage.py constance list for example:

Traceback (most recent call last):
  File "/venv/lib/python3.10/site-packages/django/apps/registry.py", line 156, in get_app_config
    return self.app_configs[app_label]
KeyError: 'admin'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/src/dashboard/manage.py", line 22, in <module>
    main()
  File "/usr/src/dashboard/manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "/venv/lib/python3.10/site-packages/django/core/management/__init__.py", line 419, in execute_from_command_line
    utility.execute()
  File "/venv/lib/python3.10/site-packages/django/core/management/__init__.py", line 413, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/venv/lib/python3.10/site-packages/django/core/management/__init__.py", line 257, in fetch_command
    klass = load_command_class(app_name, subcommand)
  File "/venv/lib/python3.10/site-packages/django/core/management/__init__.py", line 39, in load_command_class
    module = import_module('%s.management.commands.%s' % (app_name, name))
  File "/usr/lib/python3.10/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 883, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/venv/lib/python3.10/site-packages/constance/management/commands/constance.py", line 10, in <module>
    from ...admin import ConstanceForm, get_values
  File "/venv/lib/python3.10/site-packages/constance/admin.py", line 366, in <module>
    admin.site.register([Config], ConstanceAdmin)
  File "/venv/lib/python3.10/site-packages/django/utils/functional.py", line 246, in inner
    self._setup()
  File "/venv/lib/python3.10/site-packages/django/contrib/admin/sites.py", line 561, in _setup
    AdminSiteClass = import_string(apps.get_app_config('admin').default_site)
  File "/venv/lib/python3.10/site-packages/django/apps/registry.py", line 163, in get_app_config
    raise LookupError(message)
LookupError: No installed app with label 'admin'.

[camilonova]

@syre @Alirezaja1384 please confirm if this issue was resolved by installing the packed from the main branch

[Alirezaja1384]

@camilonova I just tested it. It works completely fine. Thank you.