Django 4.2: How to Handle ForeignKey IntegrityError When Deleting Parent Objects with Related Child Models
I'm stuck on something that should probably be simple. I'm working with an `IntegrityError` when trying to delete a parent object that has related child objects defined by a `ForeignKey`. My models are set up like this: ```python from django.db import models class Author(models.Model): name = models.CharField(max_length=100) class Book(models.Model): title = models.CharField(max_length=100) author = models.ForeignKey(Author, on_delete=models.CASCADE) ``` The `on_delete=models.CASCADE` should allow the deletion of `Author` instances along with their related `Book` instances, but when I attempt to delete an `Author`, I'm getting the following behavior: ``` IntegrityError: DELETE statement conflicted with FOREIGN KEY constraint "app_book_author_id_fkey" on table "app_book". ``` I have ensured that I have no orphaned `Book` entries, and I even added a signal to clean up any lingering entries, but I still encounter this scenario. Here's the relevant deletion code I'm using: ```python from django.shortcuts import get_object_or_404 from django.http import HttpResponseRedirect def delete_author(request, author_id): author = get_object_or_404(Author, pk=author_id) author.delete() return HttpResponseRedirect('/authors/') ``` I've also tried to manually delete the related `Book` instances before deleting the `Author`, but that doesn't seem to be ideal. Can anyone shed light on why I'm working with this `IntegrityError` and suggest the best practices for handling deletions in such scenarios? Am I missing something in my model relationships or deletion logic? Is there a better approach?