#32793: Problem with decimal field when upgrade version
-------------------------------------+-------------------------------------
Reporter: mohiz | Owner: nobody
Type: Bug | Status: new
Component: Database | Version: 3.2
layer (models, ORM) |
Severity: Normal | Keywords: decimal
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-------------------------------------+-------------------------------------
A simple example such as:
{{{
#!python
from django.db import models
class Foo(models.Model):
amount = models.DecimalField(
null=False,
decimal_places=18,
max_digits=44)
# A simple insertion example
from api.models import Foo
from django.db.models import F
from decimal import Decimal
f = Foo.objects.create(amount=Decimal('0.5'))
f.amount = F('amount') - Decimal('0.4')
f.save(update_fields=['amount', ])
f.refresh_from_db()
print(f.amount)
}}}
This creates an unexpected result (0.099999999999999980) in new version,
but in previous version it was ok. I checked the difference and I found
that new version sends a decimal value in a quotation, but in the previous
version it would send in number format. Below is the query for two
different versions:
{{{
#!mysql
3.1
UPDATE `api_foo` SET `amount` = (`api_foo`.`amount` - 0.4) WHERE
`api_foo`.`id` = 1
3.2
UPDATE `api_foo` SET `amount` = (`api_foo`.`amount` - '0.4') WHERE
`api_foo`.`id` = 1
}}}
I am using mysql-8.0.19.
--
Ticket URL: <https://code.djangoproject.com/ticket/32793>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
--
You received this message because you are subscribed to the Google Groups
"Django updates" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/django-updates/048.2896c0a509fa2e6a521496038848a11d%40djangoproject.com.
