#25942: TypedChoiceField.has_changed behaviour has changed between 1.8 and 1.9
---------------------------------+------------------------------------
Reporter: arthru | Owner: nobody
Type: Bug | Status: new
Component: Forms | Version: 1.9
Severity: Release blocker | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
---------------------------------+------------------------------------
Comment (by arthru):
In fact, in my case, the coerce is used using the field's to_python method
as following (my mistake, sorry) :
{{{
from django.db import models
from django.forms import TypedChoiceField
CHOICES = [
('choice1', 'Choice 1'),
('choice2', 'Choice 2'),
('choice3', 'Choice 3')
]
my_choices = models.CharField(
max_length=7,
choices=CHOICES,
null=True,
blank=True,
default=None,
)
kwargs = {
'label': 'Method',
'choices': [
('', '---------'),
('choice1', 'Choice 1'),
('choice2', 'Choice 2'),
('choice3', 'Choice 3')
],
'initial': None,
'empty_value': None,
'required': False,
'help_text': '',
'coerce': my_choices.to_python,
}
tcf = TypedChoiceField(**kwargs)
# the following line did work in django 1.8
assert not tcf.has_changed(None, '')
}}}
Overall, I detected that when using my model in a formset having an
extra=1. When submitting without touching anything, the form is treated as
a changed form due to this changed field (where it should be ignored as
nothing was changed).
--
Ticket URL: <https://code.djangoproject.com/ticket/25942#comment:3>
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