Hi all,
I'm writing a custom field wishing to implement something similar to a
multiplechoice.
The problem is that when I run syncdb I receive a
AttributeError: 'ListField' object has no attribute 'db_column'
Any idea?
my models.py is:
-------------------------------------------------------------------
from django.db import models
from cm.custom.fields import ListField
EXAMPLE_CHOICES = (
('A', 'foo'),
('B', 'bar'),
)
class Partner(models.Model):
example = ListField(separator=',', choices=EXAMPLE_CHOICES)
-------------------------------------------------------------------
ListField is defined by:
-------------------------------------------------------------------
from django.db import models
from django.core import validators
class ListField(models.Field):
__metaclass__ = models.SubfieldBase
def __init__(self, *args, **kwargs):
self.separator = kwargs['separator']
# checking if separator has been carefully chosen
for choice in kwargs['choices']:
if self.separator in choice[0]:
# separator is a character already present in choices, this cannot be
raise TypeError('Separator colliding with choices, see
choice \'%s\'.' % choice[0])
kwargs['max_length'] = 255
def to_python(self, value):
if value is None:
if self.null:
return value
else:
raise validators.ValidationError, ugettext_lazy("This
field cannot be null.")
if type(value) == type([]):
pass
elif type(value) == type(()):
value = list(value)
else:
value = str(value).split(self.separator)
value.sort()
return value
def get_db_prep_save(self, value):
return self.separator.join(value)
def get_db_prep_lookup(self, lookup_type, value):
if lookup_type == 'exact':
return self.get_db_prep_save(self.to_python(value))
elif lookup_type == 'contains':
return "%" + "%".join(self.to_python(value)) + "%"
elif lookup_type == 'isnull':
return []
else:
raise TypeError('Lookup type %r not supported.' %
lookup_type)
-------------------------------------------------------------------
complete error page:
-------------------------------------------------------------------
Traceback (most recent call last):
File "manage.py", line 11, in <module>
execute_manager(settings)
File "/usr/lib/python2.5/site-packages/django/core/management/
__init__.py", line 272, in execute_manager
utility.execute()
File "/usr/lib/python2.5/site-packages/django/core/management/
__init__.py", line 219, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/usr/lib/python2.5/site-packages/django/core/management/
base.py", line 72, in run_from_argv
self.execute(*args, **options.__dict__)
File "/usr/lib/python2.5/site-packages/django/core/management/
base.py", line 85, in execute
self.validate()
File "/usr/lib/python2.5/site-packages/django/core/management/
base.py", line 112, in validate
num_errors = get_validation_errors(s, app)
File "/usr/lib/python2.5/site-packages/django/core/management/
validation.py", line 28, in get_validation_errors
for (app_name, error) in get_app_errors().items():
File "/usr/lib/python2.5/site-packages/django/db/models/loading.py",
line 126, in get_app_errors
self._populate()
File "/usr/lib/python2.5/site-packages/django/db/models/loading.py",
line 55, in _populate
self.load_app(app_name, True)
File "/usr/lib/python2.5/site-packages/django/db/models/loading.py",
line 70, in load_app
mod = __import__(app_name, {}, {}, ['models'])
File "/home/jo/lavori/comunità montana mugello/cm/../cm/web/
models.py", line 11, in <module>
class Partner(models.Model):
File "/usr/lib/python2.5/site-packages/django/db/models/base.py",
line 62, in __new__
new_class.add_to_class(obj_name, obj)
File "/usr/lib/python2.5/site-packages/django/db/models/base.py",
line 184, in add_to_class
value.contribute_to_class(cls, name)
File "/usr/lib/python2.5/site-packages/django/db/models/fields/
subclassing.py", line 49, in contribute_to_class
super(self.__class__, self).contribute_to_class(cls, name)
File "/usr/lib/python2.5/site-packages/django/db/models/fields/
__init__.py", line 183, in contribute_to_class
self.set_attributes_from_name(name)
File "/usr/lib/python2.5/site-packages/django/db/models/fields/
__init__.py", line 179, in set_attributes_from_name
self.attname, self.column = self.get_attname_column()
File "/usr/lib/python2.5/site-packages/django/db/models/fields/
__init__.py", line 193, in get_attname_column
column = self.db_column or attname
AttributeError: 'ListField' object has no attribute 'db_column'
-------------------------------------------------------------------
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Django users" group.
To post to this group, send email to django-users@googlegroups.com
To unsubscribe from this group, send email to [EMAIL PROTECTED]
For more options, visit this group at
http://groups.google.com/group/django-users?hl=en
-~----------~----~----~----~------~----~------~--~---
