django - How to count new data before executing a function again

Question

I have this function that do automatic execution of send_sms function when certain conditions are met. That it will execute if the count for specific levels are detected.

I'm using celery to automatically execute it when needed. But my problem now is like this.

if the responses.count() >= 50: then it will execute send_sms function. but when it reaches 51 after the first execution it is still executing and it must not. I want it to recount again another NEW 50 for another execution.

How can I do it? Thanks!

def auto_sms(request):
    responses = Rainfall.objects.filter(
        level='Torrential' or 'Intense',
        timestamp__gt=now() - timedelta(days=3),
    )
    if responses.count() >= 50:
        send_sms(request)

    return HttpResponse(200)

question from:https://stackoverflow.com/questions/65617284/how-to-count-new-data-before-executing-a-function-again

Answer 1

Well, for that you could just simply use the modulo operator, like this:

def auto_sms(request):
    responses = Rainfall.objects.filter(
        level='Torrential' or 'Intense',
        timestamp__gt=now() - timedelta(days=3),
    )

    count = responses.count()
    if not (count % 50) and count > 0:
        send_sms(request)

    return HttpResponse(200)

The main changes were at if not (count % 50) and count > 0:, where there are 2 logical operations.

The first one not (count % 50) means that every number that is divisible by 50 will return True, which are 50, 100, 150, etc.

However there's a catch, 0 will also return True for the first operation and that's not something that you want. So that's the reason for the second operation count > 0.