it/itf/itfcore/fields.py
2010-03-03 19:58:00 +05:30

59 lines
2.2 KiB
Python
Executable File

from django.db import models
from django import forms
from django.utils.text import capfirst
class MultiSelectFormField(forms.MultipleChoiceField):
widget = forms.CheckboxSelectMultiple
def __init__(self, *args, **kwargs):
self.max_choices = kwargs.pop('max_choices', 0)
super(MultiSelectFormField, self).__init__(*args, **kwargs)
def clean(self, value):
if not value and self.required:
raise forms.ValidationError(self.error_messages['required'])
if value and self.max_choices and len(value) > self.max_choices:
raise forms.ValidationError('You must select a maximum of %s choice%s.'
% (apnumber(self.max_choices), pluralize(self.max_choices)))
return value
class MultiSelectField(models.Field):
__metaclass__ = models.SubfieldBase
def get_internal_type(self):
return "CharField"
def get_choices_default(self):
return self.get_choices(include_blank=False)
def _get_FIELD_display(self, field):
value = getattr(self, field.attname)
choicedict = dict(field.choices)
def formfield(self, **kwargs):
# don't call super, as that overrides default widget if it has choices
defaults = {'required': not self.blank, 'label': capfirst(self.verbose_name),
'help_text': self.help_text, 'choices':self.choices}
if self.has_default():
defaults['initial'] = self.get_default()
defaults.update(kwargs)
return MultiSelectFormField(**defaults)
def get_db_prep_value(self, value):
if isinstance(value, basestring):
return value
elif isinstance(value, list):
return ",".join(value)
def to_python(self, value):
if isinstance(value, list):
return value
return value.split(",")
def contribute_to_class(self, cls, name):
super(MultiSelectField, self).contribute_to_class(cls, name)
if self.choices:
func = lambda self, fieldname = name, choicedict = dict(self.choices):",".join([choicedict.get(value,value) for value in getattr(self,fieldname)])
setattr(cls, 'get_%s_display' % self.name, func)