👀 Views: 27 💬 Answers: 1 📅 Created: 2025-06-13

django bulk-creation foreign-key models Python

I'm trying to configure I'm encountering an issue when trying to use `bulk_create()` in Django 4.1 to create multiple instances of a model that has a ForeignKey field. The ForeignKey field is supposed to have a default value set in the model definition, but when using `bulk_create()`, it seems that the default value is not being applied. Here's a simplified version of my model: ```python from django.db import models class Category(models.Model): name = models.CharField(max_length=100) class Product(models.Model): name = models.CharField(max_length=100) category = models.ForeignKey(Category, default=1, on_delete=models.SET_DEFAULT) ``` I have a `Category` instance with an ID of 1, which is supposed to be the default for the `category` field in `Product`. When I run the following code to bulk create `Product` instances: ```python products = [Product(name='Product A'), Product(name='Product B')] Product.objects.bulk_create(products) ``` I expect both products to have the `category` set to the default `Category` (ID 1). However, after the execution, the `category` field for the products is `NULL` instead of being set to the default value. I've also checked that the database column allows nulls and that no other constraints are causing this issue. I've tried to override the `save()` method to ensure that the default is explicitly set before the bulk create, but that approach does not work, as `bulk_create()` does not call `save()` on the instances. Is this a known limitation with `bulk_create()` in Django, or am I missing something in my implementation? How can I ensure the default value for the ForeignKey field is applied during a bulk create operation? Any insights or workarounds would be greatly appreciated! I'm working with Python in a Docker container on CentOS. Is there a better approach?