What are the competition issues:
When multiple users operate on a field at the same time, there is no expected return.
F () function:
When multiple users operate on a field at the same time, there is no expected return.
F () function:
from django.db.models import F
def vote(request, choice_id):
selected_choice = question.choice_set.get(pk=request.POST['choice'])
selected_choice.votes = F('votes') + 1
selected_choice.save()
Read More:
- django.db.utils .IntegrityError: NOT NULL constraint failed: blog_ blog.author_ ID error resolution
- Importerror of Django error: no module named**
- IntegrityError at ** NOT NULL constraint failed: learning_logs_topic.owner_id
- Can’t connect to MySQL server error 111
- Some mistakes and solutions in Django
- django.core.exceptions . improveconfigured: error loading MySQL DB module. Django configuring MySQL database
- CSRF verification failed. Request aborted.
- Django + jQuery get data in the form + Ajax send data
- errorCode: 500, msg: , result: {“Message”:”There was an error processing the request
- AttributeError: module…ops‘ has no attribute ‘_TensorLike‘， ValueError: `updates` argument..eager
- Forbidden (403) CSRF verification failed. Request aborted. – Django
- Solve the problem of request method ‘get’ not supported
- [How to Fix] NameError: name ‘requests‘ is not defined & NameError: name ‘request‘ is not defined
- React Native: TypeError: Network request failed
- [nodejs] error request aborted after request routing in post mode
- Quirky error 18: transfer closed with outstanding read data rem
- Four ways to get Django parameters in request
- PIP install urlib2 failed
- Python3-ValueError:not enough values to unpack (expected 2, got 0)