👀 Views: 37 💬 Answers: 1 📅 Created: 2025-06-05

django bulk-create integrityerror unique-constraints Python

I'm getting frustrated with I've searched everywhere and can't find a clear answer. I'm currently working with an scenario when trying to use Django's `bulk_create` method with a custom manager. I have a model defined as follows: ```python from django.db import models class MyModelManager(models.Manager): def active(self): return self.filter(is_active=True) class MyModel(models.Model): name = models.CharField(max_length=255) is_active = models.BooleanField(default=True) objects = MyModelManager() ``` When I call `bulk_create` to insert multiple instances of `MyModel`, I encounter an `IntegrityError` due to unique constraints on the `name` field. Here’s the code I’m using to perform the bulk insert: ```python from django.db import transaction with transaction.atomic(): instances = [MyModel(name=f'Item {i}') for i in range(10)] MyModel.objects.bulk_create(instances) ``` The behavior I receive is: `django.db.utils.IntegrityError: UNIQUE constraint failed: app_mymodel.name`. I've verified that there are no existing records in the database that would violate this constraint, but it seems like the `bulk_create` is attempting to insert duplicates. I also tried using different combinations of data and even filtered the list of instances before the bulk insert, but I keep hitting the same scenario. I suspect it might be related to how Django handles the uniqueness constraint during bulk operations. What could be causing this behavior? Is there a way to ensure uniqueness before performing the bulk insert without loading data into memory first? Any help would be greatly appreciated! I'm working on a web app that needs to handle this. My development environment is Windows. Any help would be greatly appreciated! The stack includes Python and several other technologies. Cheers for any assistance!