Django 4.1 - Difficulty with Conditional Filtering in Django Rest Framework ViewSets
Hey everyone, I'm running into an issue that's driving me crazy. I'm working on a Django 4.1 project using Django Rest Framework (DRF) and I'm having trouble implementing conditional filtering in my ViewSet based on query parameters. I have a `Book` model that contains fields like `title`, `author`, `published_date`, and `is_published`. I want to filter the queryset based on whether a book is published or not, but only if a query parameter `published` is provided. If the parameter is `true`, I want to return only published books; if it's `false`, only unpublished books; and if it's not provided, I want to return all books. Here's what I've tried so far in my `BookViewSet`: ```python from rest_framework import viewsets from .models import Book from .serializers import BookSerializer class BookViewSet(viewsets.ModelViewSet): serializer_class = BookSerializer def get_queryset(self): queryset = Book.objects.all() published = self.request.query_params.get('published', None) if published is not None: if published.lower() == 'true': queryset = queryset.filter(is_published=True) elif published.lower() == 'false': queryset = queryset.filter(is_published=False) return queryset ``` Despite this, I'm encountering an unexpected behavior where the API returns no results even when there are books in the database. For instance, when I hit the endpoint `/books/?published=true`, I get an empty array in the response. I've verified that some books are indeed marked as published in the database. I also tried logging the `published` variable right before filtering: ```python print(published) ``` This shows `true` or `false`, depending on what I pass, but still does not affect the outcome. Am I missing something in how I'm handling the query parameter or constructing the queryset? Any insights would be greatly appreciated! I'm working on a CLI tool that needs to handle this. My development environment is CentOS.