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 Brought to You by the Letter F

Igor Protsenko
Igor Protsenko
15,651 Points
Posted by Igor Protsenko
Igor Protsenko
15,651 Points

Usage of F

So we want to update some attribute,why can we just type:

some_object.attribute+=1

What is the advantage of F?

slinkymedullae
slinkymedullae
15,422 Points

If you are trying to update more than one object at a time, you would either have to do this...

for some_object in SomeObject.objects.all():
    some_object.attribute += 1
    some_object.save()

... or you could just do this...

SomeObject.objects.all().update(attribute=F('attribute') + 1)

... which according to the documentation has some performance advantages.

1 Answer