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from __future__ import unicode_literals
from django.contrib.contenttypes.models import ContentType
from django.db import models
from django.forms import ModelForm, modelformset_factory
from django.forms.models import BaseModelFormSet
class BaseGenericInlineFormSet(BaseModelFormSet):
"""
A formset for generic inline objects to a parent.
"""
def __init__(self, data=None, files=None, instance=None, save_as_new=None,
prefix=None, queryset=None, **kwargs):
opts = self.model._meta
self.instance = instance
self.rel_name = '-'.join((
opts.app_label, opts.model_name,
self.ct_field.name, self.ct_fk_field.name,
))
if self.instance is None or self.instance.pk is None:
qs = self.model._default_manager.none()
else:
if queryset is None:
queryset = self.model._default_manager
qs = queryset.filter(**{
self.ct_field.name: ContentType.objects.get_for_model(
self.instance, for_concrete_model=self.for_concrete_model),
self.ct_fk_field.name: self.instance.pk,
})
super(BaseGenericInlineFormSet, self).__init__(
queryset=qs, data=data, files=files,
prefix=prefix,
**kwargs
)
@classmethod
def get_default_prefix(cls):
opts = cls.model._meta
return '-'.join(
(opts.app_label, opts.model_name,
cls.ct_field.name, cls.ct_fk_field.name)
)
def save_new(self, form, commit=True):
setattr(form.instance, self.ct_field.get_attname(),
ContentType.objects.get_for_model(self.instance).pk)
setattr(form.instance, self.ct_fk_field.get_attname(),
self.instance.pk)
return form.save(commit=commit)
def generic_inlineformset_factory(model, form=ModelForm,
formset=BaseGenericInlineFormSet,
ct_field="content_type", fk_field="object_id",
fields=None, exclude=None,
extra=3, can_order=False, can_delete=True,
max_num=None, formfield_callback=None,
validate_max=False, for_concrete_model=True,
min_num=None, validate_min=False):
"""
Returns a ``GenericInlineFormSet`` for the given kwargs.
You must provide ``ct_field`` and ``fk_field`` if they are different from
the defaults ``content_type`` and ``object_id`` respectively.
"""
opts = model._meta
# if there is no field called `ct_field` let the exception propagate
ct_field = opts.get_field(ct_field)
if not isinstance(ct_field, models.ForeignKey) or ct_field.remote_field.model != ContentType:
raise Exception("fk_name '%s' is not a ForeignKey to ContentType" % ct_field)
fk_field = opts.get_field(fk_field) # let the exception propagate
if exclude is not None:
exclude = list(exclude)
exclude.extend([ct_field.name, fk_field.name])
else:
exclude = [ct_field.name, fk_field.name]
FormSet = modelformset_factory(model, form=form,
formfield_callback=formfield_callback,
formset=formset,
extra=extra, can_delete=can_delete, can_order=can_order,
fields=fields, exclude=exclude, max_num=max_num,
validate_max=validate_max, min_num=min_num,
validate_min=validate_min)
FormSet.ct_field = ct_field
FormSet.ct_fk_field = fk_field
FormSet.for_concrete_model = for_concrete_model
return FormSet
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