#11707: limit_choices_to on a ForeignKey can render duplicate options in
formfield
-------------------------------------+-------------------------------------
Reporter: | Owner: nobody
Chris.Wesseling@… | Milestone:
Status: reopened | Version: SVN
Component: Forms | Keywords: ForeingKey
Resolution: | limit_choices_to
Triage Stage: Accepted | Has patch: 1
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 1 |
-------------------------------------+-------------------------------------
Comment (by anonymous):
Replying to [comment:11 charstring]:
> Replying to [comment:7 lukeplant]:
> > {{{
> > #!CommitTicketReference repository="" revision="15791"
> > Fixed #15559 - distinct queries introduced by [15607] cause errors
with some custom model fields
> > }}}
>
> Can someone point me to an example of such a custom model field or, even
better, a test showing the breakage?
The discussion linked from the description of the other ticket has an
example. It's in dpaste so may not be long-lived. Copying here for
reference:
{{{
#!python
class PointField(models.Field):
description = _("A geometric point")
__metaclass__ = models.SubfieldBase
pattern = re.compile('^\(([\d\.]+),([\d\.]+)\)$')
def db_type(self, connection):
if connection.settings_dict['ENGINE'] is not
'django.db.backends.postgresql_psycopg2':
return None
return 'point'
def to_python(self, value):
if isinstance(value, tuple):
return (float(value[0]), float(value[1]))
if not value:
return (0, 0)
match = self.pattern.findall(value)[0]
return (float(match[0]), float(match[1]))
def get_prep_value(self, value):
return self.to_python(value)
def get_db_prep_value(self, value, connection, prepared=False):
# Casts dates into the format expected by the backend
if not prepared:
value = self.get_prep_value(value)
return '({0}, {1})'.format(value[0], value[1])
def get_prep_lookup(self, lookup_type, value):
raise TypeError('Lookup type %r not supported.' % lookup_type)
def value_to_string(self, obj):
value = self._get_val_from_obj(obj)
return self.get_db_prep_value(value)
}}}
--
Ticket URL: <http://code.djangoproject.com/ticket/11707#comment:12>
Django <http://code.djangoproject.com/>
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