Re: Model field with default value and choices is always reported as changed, even if unchanged

Hi,

Am 25.02.2015 um 19:11 schrieb Carsten Fuchs:
> the parent model's History view claims that field "monat" of TestModel has been changed,

I got at least a little bit further: This is easily reproducible in a
minimal project/app test case with SQLite exactly as described in
Django's intro tutorial 01. This is the entire contents of my test app's
`models.py` file:


# -*- coding: utf-8 -*-
from django.db import models

def VormonatsMonat():
return 1

MONTHS_CHOICES = (
(1, "Jan"),
(2, "Feb"),
)

class Choice(models.Model):
choice_text = models.CharField(max_length=200)
votes = models.IntegerField(default=0)
monat = models.IntegerField(default=VormonatsMonat,
choices=MONTHS_CHOICES)


Then, at the `./manage.py shell` prompt (creating a Choice instance is
omitted here):

>>> from django.forms import ModelForm
>>> from TestApp.models import Choice
>>> class ChoiceForm(ModelForm):
... class Meta:
... model = Choice
... fields = ["choice_text", "votes", "monat"]
...
>>> ch = Choice.objects.get(pk=1)
>>> chv = Choice.objects.values().get(pk=1)
>>> ch
<Choice: Choice object>
>>> chv
{'monat': 1, 'choice_text': u'just a test', 'votes': 0, u'id': 1}
>>> ChoiceForm(chv, initial=chv, instance=ch).has_changed()
True


The expected output is `False`, which is (in a new shell session) in
fact obtained whenever the definition of field `monat` is slightly
changed, e.g. to a constant default value rather than a callable, or
with no choices.

Any thoughts please?

Best regards,
Carsten

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