Django 4.2: scenarios when using F expressions to update related fields in bulk
I'm sure I'm missing something obvious here, but I've been struggling with this for a few days now and could really use some help. I'm trying to update a field on a related model in bulk using Django 4.2, but I'm running into an scenario where the related field isn't updating as expected. I have two models, `Author` and `Book`, where `Book` has a foreign key to `Author`. I want to increase the `rating` of all books for a specific author by a certain amount using F expressions. Here’s the relevant part of my code: ```python from django.db.models import F # Assuming we have an author instance author = Author.objects.get(id=1) # Attempting to update all books for this author Book.objects.filter(author=author).update(rating=F('rating') + 1) ``` After running this query, I expected all books linked to that author to have their ratings incremented by 1. However, when I check the database, the `rating` field remains unchanged. I’ve verified that the author and books exist, and there are no issues with the database connection. I also checked the `rating` field and it seems to be configured correctly as an `IntegerField`. I tried running the query in the Django shell and I saw the same behavior. Additionally, there are no exceptions or errors being thrown during the update operation. Is there something I might be missing here? Any help or insights on why this isn't working would be greatly appreciated! I’ve also looked into using `bulk_update`, but it doesn't seem to fit my case since I want to increment the values based on their current state. What’s the correct approach to achieve this? Thanks in advance for any suggestions! My development environment is Linux. Am I missing something obvious? I'm working on a web app that needs to handle this. Is there a better approach?