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Refs #31282 -- Clarified M2O add/remove/set with PK behaviour. 

Improved error message for remove() and added tests.
This commit is contained in:
Carlton Gibson 2020-02-18 10:50:19 +01:00 committed by Carlton Gibson
parent 3bbf9a489a
commit a34cb5a6d4
2 changed files with 15 additions and 0 deletions
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4
django/db/models/fields/related_descriptors.py
View File

@ -697,6 +697,10 @@ def create_reverse_many_to_one_manager(superclass, rel):
val = self.field.get_foreign_related_value(self.instance)
old_ids = set()
for obj in objs:
if not isinstance(obj, self.model):
raise TypeError("'%s' instance expected, got %r" % (
self.model._meta.object_name, obj,
))
# Is obj actually part of this descriptor set?
if self.field.get_local_related_value(obj) == val:
old_ids.add(obj.pk)

11
tests/many_to_one/tests.py
View File

@ -733,3 +733,14 @@ class ManyToOneTests(TestCase):
child = parent.to_field_children.get()
with self.assertNumQueries(0):
self.assertIs(child.parent, parent)
def test_add_remove_set_by_pk_raises(self):
usa = Country.objects.create(name='United States')
chicago = City.objects.create(name='Chicago')
msg = "'City' instance expected, got %s" % chicago.pk
with self.assertRaisesMessage(TypeError, msg):
usa.cities.add(chicago.pk)
with self.assertRaisesMessage(TypeError, msg):
usa.cities.remove(chicago.pk)
with self.assertRaisesMessage(TypeError, msg):
usa.cities.set([chicago.pk])