ModuleNotFound error with pylint-django plugin

[living180]

Bug description

Starting with pylint 2.15, running pylint on a Django project with the pylint_django plugin enabled results in a ModuleNotFound exception. Bisecting points to commit a2c57ec as the one that exposes the issue. The reason the exception occurs is that when _astroid_module_checker() opens the the pylint_django plugin, pylint_django attempts to import the Django settings module. However, the import path has not been fixed up at this point, so the module cannot be found, thus the exception. I already have a fix working on my machine and thus hope to have a PR ready shortly.

Configuration

[MAIN]
load-plugins = pylint_django

Command used

DJANGO_SETTINGS_MODULE=demosite.settings pylint polls/models.py

Pylint output

Using env: /home/dharding/.virtualenvs/demosite
Traceback (most recent call last):
  File "/home/dharding/.local/bin/pylint", line 8, in <module>
    sys.exit(run_pylint())
  File "/home/dharding/.local/venvs/pylint/lib/python3.8/site-packages/pylint/__init__.py", line 35, in run_pylint
    PylintRun(argv or sys.argv[1:])
  File "/home/dharding/.local/venvs/pylint/lib/python3.8/site-packages/pylint/lint/run.py", line 207, in __init__
    linter.check(args)
  File "/home/dharding/.local/venvs/pylint/lib/python3.8/site-packages/pylint/lint/pylinter.py", line 693, in check
    with self._astroid_module_checker() as check_astroid_module:
  File "/usr/lib/python3.8/contextlib.py", line 113, in __enter__
    return next(self.gen)
  File "/home/dharding/.local/venvs/pylint/lib/python3.8/site-packages/pylint/lint/pylinter.py", line 990, in _astroid_module_checker
    checker.open()
  File "/home/dharding/.local/venvs/pylint/lib/python3.8/site-packages/pylint_django/checkers/foreign_key_strings.py", line 92, in open
    django.setup()
  File "/home/dharding/.virtualenvs/demosite/lib/python3.8/site-packages/django/__init__.py", line 19, in setup
    configure_logging(settings.LOGGING_CONFIG, settings.LOGGING)
  File "/home/dharding/.virtualenvs/demosite/lib/python3.8/site-packages/django/conf/__init__.py", line 92, in __getattr__
    self._setup(name)
  File "/home/dharding/.virtualenvs/demosite/lib/python3.8/site-packages/django/conf/__init__.py", line 79, in _setup
    self._wrapped = Settings(settings_module)
  File "/home/dharding/.virtualenvs/demosite/lib/python3.8/site-packages/django/conf/__init__.py", line 190, in __init__
    mod = importlib.import_module(self.SETTINGS_MODULE)
  File "/usr/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 961, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 973, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'demosite'

Expected behavior

Normal output without crashing, e.g.

Using env: /home/dharding/.virtualenvs/demosite
************* Module polls.models
polls/models.py:24: [E1101(no-member), Choice.was_published_recently] Instance of 'Choice' has no 'pub_date' member

Pylint version

pylint 2.15.8
astroid 2.12.13
Python 3.8.10 (default, Nov 14 2022, 12:59:47)
[GCC 9.4.0]

OS / Environment

Ubuntu 20.04.05

Additional dependencies

pylint-django==2.5.3