In brief, a [Typed]ChoiceField can reject a valid choice of type
Decimal because it is incorrectly compared using smart_unicode.
Decimal('0.5')==Decimal('0.50') is true, while '0.5'=='0.50' is false.
Verbosely, consider a model defined like so :
class Foo(models.Model):
BAR_CHOICES = (
(Decimal('0.25'), 'quarter'),
(Decimal('0.50'), 'unit')
)
bar = models.DecimalField(max_digits=4, decimal_places=2,
choices = BAR_CHOICES)
and a ModelForm based on it :
class FooForm(forms.ModelForm):
class Meta:
model = models.Foo
Now :
>> FooForm({'bar':'0.50'}).is_valid()
true
>> FooForm({'bar':'0.5'}).is_valid()
false # errors = {'bar': [u'Select a valid choice. 0.5 is not one
of the available choices.']}
This issue might arise when the choices are dynamically generated, as
Python isn't rigorous about trailing zeros :
>>> Decimal('1.0') + Decimal('0.5')
Decimal('1.5')
>>> Decimal('1.0') + Decimal('0.50')
Decimal('1.50')
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