How to sum time based on a given time in django?-CodePudding

class Clock(models.Model):
report_submitted_at = models.TimeField()
delivery_time = models.TimeField(null=True, Blank=True)

I am new to Django so I am curious how to achieve this. In my model report_submitted_at time I am entering. Based on the entered time i want to save the delivery time automatically. Delivery time is always '04:00:00'. So suppose i entered report_submitted_time '02:00:00'. The delivery time will be '06:00:00' for that row.

I imported datetime. Manually i am able to add two times. But here how can i save the delivery time automatically. Any help would be really appreciated. Thank you !!

CodePudding user response：

You can use Django signals like this.

from django.dispatch import receiver
from django.db import models


@receiver(signal=models.signals.post_save, sender=Clock):
def set_delivery_time(sender, instance, created, **kwargs):
    if created:  # For new objects, it will be True. In case of updating old object, it will be false
        instance.delivery_time = instance.report_submitted_at.replace(hour=instance.report_submitted_at.hour   4)
        instance.save()