Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python Django ORM Total Control F objects

Anusha Rao
PLUS
Anusha Rao
Courses Plus Student 972 Points
Posted by Anusha Rao
Anusha Rao
Courses Plus Student 972 Points

Double the rating field using F .

I don't know where am I going wrong here!

products/emergency.py 
from django.db.models import F

from .models import Review

def double_ratings():
    reviews = Review.objects.all()
    reviews.update(rating = F('rating') * 2)
    reviews.save()

1 Answer

Idai Yaffe
Idai Yaffe
20,429 Points
Idai Yaffe
Idai Yaffe
20,429 Points

You do not need to save the objects after an update so the 'reviews' variable is unnecessary.

Just use:

def double_ratings():
    Review.objects.update(rating=F('rating')*2)

I think your code will work and the challenge doesn't like it but I'm not sure

Chris Freeman
Chris Freeman
Treehouse Moderator 68,454 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,454 Points

Promoting to answer. The code will work if Anusha's import statement is used. It differs from the initial import provided by the challenge. Anusha's allows referencing Review directly and not needed to use models.Review.