👀 Views: 68 💬 Answers: 1 📅 Created: 2025-06-05

django bulk-create foreign-key integrityerror Python

I've searched everywhere and can't find a clear answer... I'm experiencing a question when trying to perform a bulk create on a model that has a ForeignKey relationship. Specifically, I have two models: `Author` and `Book`, where each `Book` has a ForeignKey to `Author`. I want to create multiple `Book` instances in a single database call using `bulk_create`, but I'm running into integrity errors related to the ForeignKey. Here’s my code: ```python from myapp.models import Author, Book def create_books(): authors = Author.objects.bulk_create([ Author(name='Author A'), Author(name='Author B') ]) books = [ Book(title='Book 1', author=authors[0]), Book(title='Book 2', author=authors[1]), Book(title='Book 3', author=None) # Testing with a None foreign key ] try: Book.objects.bulk_create(books) except IntegrityError as e: print(f"IntegrityError: {e}") create_books() ``` When I run this, I get an `IntegrityError` stating that the foreign key constraint fails because the authors haven't been properly linked. I understand that `bulk_create` does not return the primary keys of created instances, which seems to be causing the scenario. I've also tried assigning the authors directly using `Author.objects.get()` after the bulk create, but that defeats the purpose of using `bulk_create` for performance reasons. Is there a best practice for this scenario, or a way to handle bulk creation with ForeignKey relationships while ensuring data integrity? Any suggestions would be greatly appreciated! This is part of a larger application I'm building. What am I doing wrong? I'm developing on Debian with Python. I'm open to any suggestions. This is happening in both development and production on Debian. Hoping someone can shed some light on this.