django += 1 increments by 2 instead of 1

[kaushik kothiya]

from django.db.models import F
from hotel.models import Hotel

Hotel.objects.filter(city='Chicago').update(total_like=F('total_like'+1))

total_like += 1 increments by 2 instead of 1
So here is my question: What kind of locking mechanisms are available to Django, to deal with situations similar to this?

After installing the channel and HTTPS request also send wia asgi. but if the same code is in use WSGI request then working fine.

​https://stackoverflow.com/questions/68778007/django-1-increments-by-2-instead-of-1
​https://stackoverflow.com/questions/1030270/race-conditions-in-django

[kaushik kothiya]

Code photo

[kaushik kothiya]

ASGI File

[Mariusz Felisiak]

Thanks for this ticket, however Trac is not a support channel and it's a support question. You can use select_for_update() to protect yourself against the race conditions (it's already mentioned in Stack Overflow's answers). Closing per TicketClosingReasons/UseSupportChannels.