Extension to the normal ManyToManyField to support default values.
Build for the following use case:
publish_on = ManyToManyFieldWithDefault(Site, verbose_name=_('publish on'), default=Site.objects.get_current)
Where with a plain ManyToManyField the default site will not be selected. The ManyToManyFieldWithDefault fixes this by automatically selecting the default value if no other selections are given.
When the field also have null=True and Blank=True it will not select the default !
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | from django import oldforms
from django.db import models
from django.utils.functional import curry
class SelectMultipleFieldWithDefault(oldforms.SelectMultipleField):
def __init__(self, default_choice=None, *args, **kwargs):
self.__default_choice = default_choice
super(SelectMultipleFieldWithDefault, self).__init__(*args, **kwargs)
def render(self, data):
if not data and self.__default_choice:
data = [self.__default_choice.id]
return super(SelectMultipleFieldWithDefault, self).render(data)
class ManyToManyFieldWithDefault(models.ManyToManyField):
def __init__(self, *args, **kwargs):
if not kwargs.get('blank', False) and not kwargs.get('null', False):
self.__default_choice = kwargs.get('default', None)
else:
self.__default_choice = None
super(ManyToManyFieldWithDefault, self).__init__(*args, **kwargs)
def get_manipulator_field_objs(self):
if self.rel.raw_id_admin:
return [oldforms.RawIdAdminField]
else:
choices = self.get_choices_default()
return [curry(SelectMultipleFieldWithDefault, size=min(max(len(choices), 5), 15), choices=choices, default_choice=self.__default_choice)]
|
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