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Source code for django.contrib.contenttypes.forms

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


[docs]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)
[docs]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.rel.to != 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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