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Added a test to ensure bad assignation to M2M doesn't clear data 

Refs #14394.
This commit is contained in:
Claude Paroz 2014-12-24 14:13:58 +01:00
parent 5dddd79433
commit 7ce9644d93
1 changed files with 12 additions and 0 deletions
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12
tests/m2m_regress/tests.py
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@ -97,3 +97,15 @@ class M2MRegressionTests(TestCase):
# causes a TypeError in add_lazy_relation # causes a TypeError in add_lazy_relation
m1 = RegressionModelSplit(name='1') m1 = RegressionModelSplit(name='1')
m1.save() m1.save()
def test_assigning_invalid_data_to_m2m_doesnt_clear_existing_relations(self):
t1 = Tag.objects.create(name='t1')
t2 = Tag.objects.create(name='t2')
c1 = TagCollection.objects.create(name='c1')
c1.tags = [t1, t2]
with self.assertRaises(TypeError):
c1.tags = 7
c1.refresh_from_db()
self.assertQuerysetEqual(c1.tags.order_by('name'), ["<Tag: t1>", "<Tag: t2>"])