Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Python Django ORM Total Control prefetch_related

We can't stop the query in product_detail for the Reviews that belong to a Product, but we can move it up so it's done B

We can't stop the query in product_detail for the Reviews that belong to a Product, but we can move it up so it's done at the same time as fetching the product.

First, though, change the product = get_object_or_404(...) to be a try and except combo that raises an Http404 exception if the Product doesn't exist.

Bummer! Didn't get a 200.; Didn't get a 404.

help thanx in advance

import datetime

from django.db.models import Q, Avg
from django.http import Http404
from django.shortcuts import render, get_object_or_404

from . import models

def good_reviews(request):
    reviews = models.Review.objects.filter(rating__gte=3)
    return render(request, 'products/reviews.html', {'reviews': reviews})

def recent_reviews(request):
    six_months_ago = datetime.datetime.today() - datetime.timedelta(days=180)
    reviews = models.Review.objects.exclude(created_at__lt=six_months_ago)
    return render(request, 'products/reviews.html', {'reviews': reviews})

def product_detail(request, pk):
        product = get_object(models.Product, pk=pk)
    except Product.DoesNotExist:
        raise Http404('')

    four_weeks_ago = datetime.datetime.today() - datetime.timedelta(weeks=4)
    reviews = product.review_set.filter(Q(rating__gte=8)|Q(created_at__gte=four_weeks_ago)).order_by('-created_at').all()
    return render(request, 'products/product_detail.html', {'product': product, 'reviews': reviews})

def product_list(request):
    products = models.Product.objects.annotate(avg_rating=Avg('review__rating')).all()
    return render(request, 'products/product_list.html', {'products': products})

2 Answers

Chris Freeman
Chris Freeman
Treehouse Moderator 68,179 Points

The is no function get_object(). The challenge wants you to use the previously learned method using models.Product.objects.get(pk=pk).

The exception error class should include the models module name: models.Product.DoesNotExist. Product does not exist outside of the models namespace.

This should get you to Task 2. Good Luck!!!

Thank you it passes