Django: How to add 2 days to an existing date entered by user

Question

I am trying to add a a payment due date 2 days after the event

class Payment(models.Model):       
    event_date = models.DateField()        
    payment_due_date = models.DateField()    


    class Meta:
        ordering = ["payment_due_date"]

    def payment_due_date(self):
         event_date = self.event_date
         return event_date + datetime.timedelta(days=2)

Pycharm gives me a error highligting Expected type 'timedelta', got 'DateField' instead more... (Ctrl+F1)

how can I fix this issue

Error in Terminal

match = date_re.match(value) TypeError: expected string or bytes-like object

JoshG · Accepted Answer · 2019-02-13T02:09:50.377

15

You could override your save() method in your model.

Note that a DateTimeField in Django becomes a datetime.datetime object. So to retrieve the date from it, you need to call field.date().

Example:

models.py

from django.db import models
import datetime

class Payment(models.Model):
    event_date = models.DateField()
    payment_due_date = models.DateField()

    class Meta:
        ordering = ["payment_due_date"]

    def save(self, *args, **kwargs):
        if self.payment_due_date is None:
            self.payment_due_date = self.event_date.date() + datetime.timedelta(days=2)
        super(Payment, self).save(*args, **kwargs)

edited Feb 13 '19 at 02:09

answered Feb 12 '19 at 20:10

JoshG

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`Expected type 'timedelta', got 'DateField' instead more... (Ctrl+F1)` getting this error in pycharm – Samir Tendulkar Feb 12 '19 at 20:15
@MarcoBianchi Just curious...what if you try `datetime.timedelta(hours=48)` instead of `days`. Do you get the same error? – JoshG Feb 12 '19 at 20:18
I mean this code works with something like `datetime.today() + datetime.timedelta(days=2)` Its just that If I add a django field it gives the above error – Samir Tendulkar Feb 12 '19 at 20:51
@MarcoBianchi I think you might need to call the `date()` method on the field. See my updated code above. – JoshG Feb 13 '19 at 02:10
I think this did it. Pycharm not giving any error. Will check the code – Samir Tendulkar Feb 13 '19 at 18:38

Django: How to add 2 days to an existing date entered by user

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