Django 4.1: How to Handle Concurrent Updates to a Model Without Race Conditions?
I'm dealing with I'm currently working on a Django 4.1 application where multiple users can update the same model instance simultaneously... I keep running into race condition issues, leading to unexpected behavior where the last update overwrites changes made by other users. For instance, when two users modify the same `Profile` instance at nearly the same time, the updates aren't merged and the last save wins. I've tried using `select_for_update()` in my view to lock the row while it's being updated, but it seems to lead to deadlocks when multiple requests try to access the same instance. Here's the code snippet from my view: ```python from django.db import transaction from django.shortcuts import get_object_or_404 from .models import Profile @transaction.atomic def update_profile(request, profile_id): profile = get_object_or_404(Profile.objects.select_for_update(), id=profile_id) if request.method == 'POST': profile.name = request.POST.get('name') profile.save() return redirect('profile_detail', profile_id=profile.id) return render(request, 'edit_profile.html', {'profile': profile}) ``` While this approach prevents some issues, it doesn't seem robust enough for heavy traffic scenarios, and I'm still encountering deadlocks intermittently. Is there a better way to handle concurrent updates to prevent race conditions and ensure data integrity? Should I consider using a message queue or a different database isolation level? Any recommendations or patterns that could help would be appreciated. What am I doing wrong? What's the best practice here? For context: I'm using Python on Ubuntu 22.04. Thanks, I really appreciate it!