0 value in Django PositiveIntegerField?

Question

Can a field of type models.PositiveIntegerField contain a 0 value? I'm doing something like:

points = models.PositiveIntegerField()

Thanks,

I know I should try it myself, but I haven't a Django environment here.

score 38 · Accepted Answer · answered Feb 11 '10 at 23:42

38

Yes, it can. It is debatable whether it should--there is a longstanding bug report: http://code.djangoproject.com/ticket/7609

answered Feb 11 '10 at 23:42

Michael Greene

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score 7 · Answer 2 · edited Nov 22 '22 at 08:30

7

For those looking to exclude the 0, it's easy to write a validator for that.

def validate_nonzero(value):
    if value == 0:
        raise ValidationError(
            _('Quantity %(value)s is not allowed'),
            params={'value': value},
        )

and then use it as such

fill_qty = models.PositiveIntegerField(
  default=0,
  validators=[MaxValueValidator(1000000), validate_nonzero]
)

edited Nov 22 '22 at 08:30

djvg

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answered Mar 16 '17 at 08:35

Shadi

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what makes you say that? – Shadi Mar 31 '17 at 11:12
2

May be my personal experience. And with this said on the docs, https://docs.djangoproject.com/en/1.11/ref/validators/#how-validators-are-run I can go to any part of the world and shout it out loud. :) – Babu Mar 31 '17 at 15:12
1

[`MinValueValidator`](https://docs.djangoproject.com/en/dev/ref/validators/#django.core.validators.MinValueValidator) exists – Boris Verkhovskiy Aug 13 '20 at 19:28
@Boris MinValueValidator cannot be used to validate that the value is just `>0`. – ruohola Jul 22 '21 at 09:24
@ruohola why not? – Boris Verkhovskiy Jul 22 '21 at 15:47
@Boris Ah, yeah. Actually it works okish for integer fields. – ruohola Jul 22 '21 at 16:28
@ruohola why "okish"? It works for floats too, the source code is literally one line. https://github.com/django/django/blob/65b880b7268dd8fe97fde5af77bede46305eb499/django/core/validators.py#L392 – Boris Verkhovskiy Jul 22 '21 at 16:37
@Boris No it does not work for floats, there is no smallest non-zero positive float. – ruohola Jul 23 '21 at 04:34

score 6 · Answer 3 · edited Apr 22 '17 at 19:53

6

Yes.

The model field reference says so. For completeness, also quoted here:

PositiveIntegerField
class PositiveIntegerField([**options])
Like an IntegerField, but must be either positive or zero (0). The value 0 is accepted for backward compatibility reasons.

edited Apr 22 '17 at 19:53

Tony

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answered Aug 03 '12 at 00:50

jontsai

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score 4 · Answer 4 · answered Feb 21 '18 at 23:00

4

Well by the definition of a Positive Integer, it shouldn't accept a zero value, but django actually considers it in the sense of none-negative number which is zero inclusive. So, Yes it can accept a zero value

answered Feb 21 '18 at 23:00

Pastor Emmanuel

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"The value 0 is accepted for backward compatibility reasons." – Paolo Dec 01 '18 at 08:50

score 3 · Answer 5 · edited Feb 09 '23 at 05:24

Yes, "PositiveIntegerField" can contain "0" value.

For example, I defined the model "Point" as shown below:

# "myapp/models.py"

from django.db import models

class Point(models.Model):
    points = models.PositiveIntegerField()

Then, run this command below:

python manage.py makemigrations && python manage.py migrate

Now, I opened "db.sqlite3" then as you can see, "CHECK("points" >= 0)" is set to "points" field which means "PositiveIntegerField" can contain "0" value:

0 value in Django PositiveIntegerField?

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