Error 'expected string or bytes-like object' in Django

Question

I'm trying to create a new record in my Django model but I just can't. Here is the Sell class model:

class Sell(models.Model):
    item = models.OneToOneField(Buy, related_name='sell', on_delete=models.CASCADE)
    date = models.DateField(default=timezone.now)
    discount = models.DecimalField(max_digits=6, decimal_places=2)
    total_paid = models.DecimalField(max_digits=6, decimal_places=2)
    buyer = models.ForeignKey(User, related_name='sell', on_delete=models.CASCADE)

Here is the code in my view.py:

    Sell.objects.create(item=item,
                        date=timezone.now,
                        discount=Decimal(0.00),
                        total_paid=cart.get_total_price(),
                        buyer=request.user, )

If I print all of this variables, the result is:

    print(item)
    266
    print(type(item))
    <class 'dma.models.Buy'>
    
    print(timezone.now)
    <function datetime.date at 0x03D3F460>
    print(type(timezone.now))
    <class 'function'>
    
    print(type(Decimal(0.00)))
    <class 'decimal.Decimal'>
    
    print(cart.get_total_price())
    68.00
    print(type(cart.get_total_price()))
    <class 'decimal.Decimal'>
    
    print(request.user)
    Felipe
    print(type(request.user))
    <class 'django.utils.functional.SimpleLazyObject'>

Error:

Exception Type: TypeError Exception Value:
expected string or bytes-like object

@AKX It is the same he just reordered it , Like the create function he put it before the print statements on SO but in his code it came last . — RaoufM
– RaoufM, Commented Jul 30, 2020 at 11:00
@RaoufM No, it's not. The traceback shows date=datetime.date, the pasted code doesn't. — AKX
– AKX, Commented Jul 30, 2020 at 11:33
Guys, thank you! The code is now working. I should've made some mistaken and the initial code: Sell.objects.create(item=item, date=timezone.now(), discount=Decimal(0.00), total_paid=cart.get_total_price(), buyer=request.user, ) is now running properly. — Felipe Dourado
– Felipe Dourado, Commented Jul 30, 2020 at 11:46

JPG · Accepted Answer · 2020-07-30 05:11:59Z

3

You should evaluate the timezone.now by calling the function,

date=timezone.now()

Sell.objects.create(item=item,
              date=timezone.now(),
              discount=Decimal(0.00),
              total_paid=cart.get_total_price(),
              buyer=request.user, )

answered Jul 30, 2020 at 5:11

JPG

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3 Comments

Felipe Dourado Over a year ago

Thank you so much! I don't know exactly what happened but the code is now working properly without this 'timezone.now' evaluate. Btw, why this evaluation is necessary?

JPG Over a year ago

timezone.now is the function and timezone.now() is the result of the fucntion

Felipe Dourado Over a year ago

In this case I'm not evaluating and the code seems to work correctly with only this lines: Sell.objects.create(item=item, date=timezone.now(), discount=Decimal(0.00), total_paid=cart.get_total_price(), buyer=request.user, ). Is it everything OK if I not add the first line 'date=timezone.now()'?

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