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Fixed #31095 -- Made RelatedManager.set() preserve existing m2m relations with an invalid type.

This commit is contained in:
Hasan Ramezani 2019-12-19 11:08:02 +01:00 committed by Mariusz Felisiak
parent 5a4d7285bd
commit a3fc24f014
2 changed files with 15 additions and 1 deletions
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3
django/db/models/fields/related_descriptors.py
View File

@ -999,7 +999,8 @@ def create_forward_many_to_many_manager(superclass, rel, reverse):
for obj in objs:
fk_val = (
self.target_field.get_foreign_related_value(obj)[0]
if isinstance(obj, self.model) else obj
if isinstance(obj, self.model)
else self.target_field.get_prep_value(obj)
)
if fk_val in old_ids:
old_ids.remove(fk_val)

13
tests/many_to_many/tests.py
View File

@ -469,6 +469,19 @@ class ManyToManyTests(TestCase):
self.a4.publications.set([], clear=True)
self.assertQuerysetEqual(self.a4.publications.all(), [])
def test_set_existing_different_type(self):
# Existing many-to-many relations remain the same for values provided
# with a different type.
ids = set(Publication.article_set.through.objects.filter(
article__in=[self.a4, self.a3],
publication=self.p2,
).values_list('id', flat=True))
self.p2.article_set.set([str(self.a4.pk), str(self.a3.pk)])
new_ids = set(Publication.article_set.through.objects.filter(
publication=self.p2,
).values_list('id', flat=True))
self.assertEqual(ids, new_ids)
def test_assign_forward(self):
msg = (
"Direct assignment to the reverse side of a many-to-many set is "