Commit 227a0f27 authored by Gavin Wahl's avatar Gavin Wahl Committed by Anssi Kääriäinen
Browse files

[1.6.x] Fixed #22998 -- Updated the fast_delete logic for GFKs 

Backport of 6e2b82fd from master
parent 609153d2

django/db/models/deletion.py

+3 −3
Original line number Diff line number Diff line
@@ -136,9 +136,9 @@ class Collector(object): 
            include_hidden=True, include_proxy_eq=True):

            if related.field.rel.on_delete is not DO_NOTHING:

                return False

        # GFK deletes

        for relation in opts.many_to_many:

            if not relation.rel.through:

        for field in model._meta.virtual_fields:

            if hasattr(field, 'bulk_related_objects'):

                # It's something like generic foreign key.

                return False

        return True

tests/generic_relations_regress/models.py

+24 −0
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ from django.contrib.contenttypes import generic 
from django.contrib.contenttypes.models import ContentType

from django.db import models

from django.utils.encoding import python_2_unicode_compatible

from django.db.models.deletion import ProtectedError





__all__ = ('Link', 'Place', 'Restaurant', 'Person', 'Address',
@@ -164,3 +165,26 @@ class D(models.Model): 


    class Meta:

        ordering = ('id',)





# Ticket #22998



class Node(models.Model):

    content_type = models.ForeignKey(ContentType)

    object_id = models.PositiveIntegerField()

    content = generic.GenericForeignKey('content_type', 'object_id')





class Content(models.Model):

    nodes = generic.GenericRelation(Node)

    related_obj = models.ForeignKey('Related', on_delete=models.CASCADE)





class Related(models.Model):

    pass





def prevent_deletes(sender, instance, **kwargs):

    raise ProtectedError("Not allowed to delete.", [instance])



models.signals.pre_delete.connect(prevent_deletes, sender=Node)

tests/generic_relations_regress/tests.py

+14 −1
Original line number Diff line number Diff line
@@ -2,11 +2,14 @@ from django.db.models import Q 
from django.db.utils import IntegrityError

from django.test import TestCase, skipIfDBFeature

from django.forms.models import modelform_factory

from django.db.models.deletion import ProtectedError



from .models import (

    Address, Place, Restaurant, Link, CharLink, TextLink,

    Person, Contact, Note, Organization, OddRelation1, OddRelation2, Company,

    Developer, Team, Guild, Tag, Board, HasLinkThing, A, B, C, D)

    Developer, Team, Guild, Tag, Board, HasLinkThing, A, B, C, D,

    Related, Content, Node,

)





class GenericRelationTests(TestCase):
@@ -223,3 +226,13 @@ class GenericRelationTests(TestCase): 
        form.save()

        links = HasLinkThing._meta.get_field_by_name('links')[0].field

        self.assertEqual(links.save_form_data_calls, 1)



    def test_ticket_22998(self):

        related = Related.objects.create()

        content = Content.objects.create(related_obj=related)

        node = Node.objects.create(content=content)



        # deleting the Related cascades to the Content cascades to the Node,

        # where the pre_delete signal should fire and prevent deletion.

        with self.assertRaises(ProtectedError):

            related.delete()