Simple Django super class to track user and save creator and modifier of a Model.

middleware.py

from myapp.utils import set_current_user


class CurrentUserMiddleware:
    def process_request(self, request):
        set_current_user(getattr(request, 'user', None))

models.py

from django.db import models
from django.contrib.auth.models import User

from myapp.utils import get_current_user


class FollowUserModel(models.Model):
    created_at = models.ForeignKey(auto_now_add=True)
    modified_at = models.ForeignKey(auto_now=True)
    created_by = models.ForeignKey(User, null=True, editable=False, related_name='%(class)s_created')
    modified_by = models.ForeignKey(User, null=True, editable=False, related_name='%(class)s_modified')

    def save(self, *args, **kwargs):
        user = get_current_user()
        if user and user.is_authenticated():
            self.modified_by = user
            if not self.id:
                self.created_by = user
        super(FollowUserModel, self).save(*args, **kwargs)

    class Meta:
        abstract = True

settings.py

MIDDLEWARE_CLASSES = (
    # ...
    'myapp.middleware.CurrentUserMiddleware',
)

utils.py

import threading


_thread_locals = threading.local()

def set_current_user(user):
    _thread_locals.user=user

def get_current_user():
    return getattr(_thread_locals, 'user', None)

Also according to : https://stackoverflow.com/questions/907695/in-a-django-model-custom-save-method-how-should-you-identify-a-new-object/35647389#35647389
it is better to use:

if self._state.adding:
    self.created_by = user

In some cases models don't have self.id or self.pk:

• When the primary field is a UUID
• On a OneToOne relationship

Also, I would suggest removing the user from the local thread after the request has been processed.
I had some tests that failed because they all share the same local thread when launch directly from the test class.

class CurrentUserMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response
        # One-time configuration and initialization.

    def __call__(self, request):

        set_current_user(getattr(request, 'user', None))

        response = self.get_response(request)

        remove_current_user()
        # Code to be executed for each request/response after
        # the view is called.

        return response

def remove_current_user():
    _thread_locals.user = None

@KrYpTeD974

are you able to provide your complete files? please