How to put timedelta in django model?

Question

With inspectdb I was able to get a \"interval\" field from postgres into django. In Django, it was a TextField. The object that I retrieved was indeed a timedelta object!

Answer 1

There is a ticket which dates back to July 2006 relating to this: https://code.djangoproject.com/ticket/2443

Several patches were written but the one that was turned in to a project: https://github.com/johnpaulett/django-durationfield

Compared to all the other answers here this project is mature and would have been merged to core except that its inclusion is currently considered to be "bloaty".

Personally, I've just tried a bunch of solutions and this is the one that works beautifully.

from django.db import models
from durationfield.db.models.fields.duration import DurationField

class Event(models.Model):
    start = models.DateTimeField()
    duration = DurationField()

    @property
    def finish(self):
        return self.start + self.duration

Result:

$ evt = Event.objects.create(start=datetime.datetime.now(), duration='1 week')
$ evt.finish
Out[]: datetime.datetime(2013, 6, 13, 5, 29, 29, 404753)

And in admin:

Change event

Duration: 7 days, 0:00:00