👀 Views: 18 💬 Answers: 1 📅 Created: 2025-06-02

django bulk-create foreign-key models Python

After trying multiple solutions online, I still can't figure this out. I'm following best practices but I'm having trouble with I'm working with an scenario when trying to perform a bulk create operation using Django 4.1 with related fields. I have a model `Author` that has a foreign key relationship with the model `Book`. Here's a simplified version of my models: ```python 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) ``` I want to create multiple `Book` instances for a specific `Author`. Here is how I'm trying to do it: ```python from myapp.models import Author, Book # Assume we have an author instance author = Author.objects.create(name='John Doe') # Attempting to bulk create books books_to_create = [Book(title='Book 1', author=author), Book(title='Book 2', author=author)] Book.objects.bulk_create(books_to_create) ``` However, I get this behavior: `django.db.utils.IntegrityError: NOT NULL constraint failed: myapp_book.author_id`. This seems to imply that the `author` foreign key is not being set properly during the bulk create operation. I also tried to use `Book.objects.bulk_create(books_to_create, ignore_conflicts=True)` but received the same behavior. I thought that by creating the `Author` instance first and then associating it with the `Book` instances, it should work seamlessly. I also verified that the `author` object is not `None` by printing it out before the bulk create. Is there something specific about bulk create that I might be missing, or is there a better way to handle this scenario in Django 4.1? I'd really appreciate any guidance on this. I've been using Python for about a year now. I'm working in a Windows 10 environment. Am I approaching this the right way? This is for a web app running on Windows 11. I'm on Ubuntu 22.04 using the latest version of Python. How would you solve this?