#28067: Encoding error when __str__ returns non-ASCII
-------------------------------------+-------------------------------------
Reporter: | Owner: nobody
Christophe Pettus |
Type: Bug | Status: new
Component: Database | Version: 1.11
layer (models, ORM) |
Severity: Normal | Keywords:
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-------------------------------------+-------------------------------------
The __str__ method (as implemented using six) strips off the "unicodeness"
of a string. If chained together, this can result in an error:
{{{
from django.db import models
from django.utils.encoding import python_2_unicode_compatible
@python_2_unicode_compatible
class A(models.Model):
c = models.CharField(max_length=20)
def __str__(self):
return self.c
@python_2_unicode_compatible
class B(models.Model):
a = models.ForeignKey(A)
def __str__(self):
return str(self.a)
}}}
{{{
>>> from test.models import A, B
>>> a = A(c=u'réparer')
>>> a.save()
>>> b = B(a=a)
>>> b.save()
>>> a
<A: réparer>
>>> b
<B: [Bad Unicode data]>
>>> print b
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/Users/xof/Documents/Dev/environments/peep/lib/python2.7/site-
packages/django/utils/six.py", line 842, in <lambda>
klass.__str__ = lambda self: self.__unicode__().encode('utf-8')
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 1:
ordinal not in range(128)
}}}
Note that the same behavior exists without @python_2_unicode_compatible,
but the example uses so as to follow the correct path.
This is probably a bug in six (shouldn't __str__ preserve its unicode type
in this case?), but we might want to ameliorate it.
--
Ticket URL: <https://code.djangoproject.com/ticket/28067>
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