Django ORM Querying with Prefetch Related: Unexpected Duplicate Records
I'm prototyping a solution and I'm having trouble with Django's ORM when using `prefetch_related` to fetch related objects... My model structure involves `Author` and `Book`, where an author can have multiple books. When I try to access the related books using `prefetch_related`, I end up with duplicate authors in the queryset, which is not the expected behavior. Here's my model setup: ```python class Author(models.Model): name = models.CharField(max_length=100) class Book(models.Model): title = models.CharField(max_length=200) author = models.ForeignKey(Author, related_name='books', on_delete=models.CASCADE) ``` When I execute the following query: ```python authors = Author.objects.prefetch_related('books').all() ``` ...and loop through the authors like this: ```python for author in authors: print(author.name) for book in author.books.all(): print(f' - {book.title}') ``` I sometimes see the same author printed multiple times, even though the expected output should have each author listed once followed by their respective books. This scenario seems to occur intermittently but is common when there are a larger number of books associated with an author. I've already tried clearing the query cache and ensuring my database is not returning duplicate rows. I'm using Django 3.2 and PostgreSQL 12. Has anyone encountered this question or know how to fix it? What am I doing wrong? This is part of a larger service I'm building. Any pointers in the right direction? For context: I'm using Python on Linux. Any examples would be super helpful. The stack includes Python and several other technologies. Any advice would be much appreciated.