Hello,
I wrote a custom field and I would like to have a proper widget in
admin.
As you may guess reading my code I would like to manage that field
with a multiselect, but instead I get a regular select in admin. How
should I do it?
(relevant part should be definition of formfield)
#--------------------------------------------
from django.db import models
from django.core import validators
from django import newforms as forms
class MultipleChoiceField(models.TextField):
__metaclass__ = models.SubfieldBase
def __init__(self, *args, **kwargs):
if 'separator' in kwargs:
self.separator = kwargs.pop('separator')
else:
self.separator = '|'
for choice in kwargs['choices']:
if self.separator in choice[0]:
raise TypeError('Separator \'%s\' colliding with
choices, see choice \'%s\'.' % (self.separator, choice[0]))
super(MultipleChoiceField, self).__init__(*args, **kwargs)
def formfield(self, **kwargs):
defaults = {'form_class': forms.ModelMultipleChoiceField,
'widget': forms.SelectMultiple}
defaults.update(kwargs)
return super(MultipleChoiceField, self).formfield(**defaults)
def get_internal_type(self):
return "TextField"
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.")
return
str(value).strip(self.separator).split(self.separator*2)
def get_db_prep_save(self, value):
if type(value) == type([]):
value = list(set(value))
elif type(value) == type(()):
value = list(value)
elif type(value) == type(''):
value = [value]
elif type(value) == type(0):
value = [str(value)]
else:
raise TypeError('Lookup value type %r not supported.' %
type(value))
value.sort()
return self.separator + (self.separator*2).join(value) +
self.separator
def get_db_prep_lookup(self, lookup_type, value):
if lookup_type == 'exact':
return self.get_db_prep_save(value)
if lookup_type == 'contains':
value.sort()
return '%' + '%'.join([self.separator + v + self.separator
for v in value]) + '%'
else:
raise TypeError('Lookup type %r not supported.' %
lookup_type)
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