👀 Views: 54 💬 Answers: 1 📅 Created: 2025-06-02

django queryset custom-manager Python

Does anyone know how to I'm converting an old project and I'm working with a frustrating scenario while working with Django's custom model managers..... I have a custom manager method that is supposed to return a queryset filtered by a specific condition, but when I call this method, I get a 'TypeError: 'NoneType' object is not subscriptable'. Here's the relevant part of my code: ```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=100) is_active = models.BooleanField(default=True) objects = MyModelManager() ``` When I try to use this manager in my view, like so: ```python from django.shortcuts import render from .models import MyModel def my_view(request): active_items = MyModel.objects.active() return render(request, 'my_template.html', {'items': active_items}) ``` I'm getting this behavior: `TypeError: 'NoneType' object is not subscriptable` when the template tries to iterate over `items` in `my_template.html`. I verified that there are indeed active items in the database, and I even tried changing the `active` method to just return `self.all()` to see if the scenario continues, but I still get the same behavior. I've checked the template as well, and it's a straightforward loop like this: ```html {% for item in items %} <p>{{ item.name }}</p> {% endfor %} ``` Is there something I'm missing, or could I be misusing the queryset? Any insights would be greatly appreciated! Has anyone else encountered this? This is for a CLI tool running on macOS. Any help would be greatly appreciated! Is there a better approach?