Fixed #35676 -- Made BaseModelForm validate constraints that reference an InlineForeignKeyField.

Co-authored-by: Simon Charette <charette.s@gmail.com>

2 files changed, 40 insertions, 0 deletions

diff --git a/tests/inline_formsets/models.py b/tests/inline_formsets/models.py
index f4c06e8fac..a090387c42 100644
--- a/tests/inline_formsets/models.py
+++ b/tests/inline_formsets/models.py
@@ -15,6 +15,11 @@ class Child(models.Model):
     school = models.ForeignKey(School, models.CASCADE)
     name = models.CharField(max_length=100)
 
+    class Meta:
+        constraints = [
+            models.UniqueConstraint("mother", "father", name="unique_parents"),
+        ]
+
 
 class Poet(models.Model):
     name = models.CharField(max_length=100)
diff --git a/tests/inline_formsets/tests.py b/tests/inline_formsets/tests.py
index 1ae9b3f760..0fe9766dc6 100644
--- a/tests/inline_formsets/tests.py
+++ b/tests/inline_formsets/tests.py
@@ -215,3 +215,38 @@ class InlineFormsetFactoryTest(TestCase):
         )
         formset = PoemFormSet(None, instance=poet)
         formset.forms  # Trigger form instantiation to run the assert above.
+
+
+class InlineFormsetConstraintsValidationTests(TestCase):
+    def test_constraint_refs_inline_foreignkey_field(self):
+        """
+        Constraints that reference an InlineForeignKeyField should not be
+        skipped from validation (#35676).
+        """
+        ChildFormSet = inlineformset_factory(
+            Parent,
+            Child,
+            fk_name="mother",
+            fields="__all__",
+            extra=1,
+        )
+        father = Parent.objects.create(name="James")
+        school = School.objects.create(name="Hogwarts")
+        mother = Parent.objects.create(name="Lily")
+        Child.objects.create(name="Harry", father=father, mother=mother, school=school)
+        data = {
+            "mothers_children-TOTAL_FORMS": "1",
+            "mothers_children-INITIAL_FORMS": "0",
+            "mothers_children-MIN_NUM_FORMS": "0",
+            "mothers_children-MAX_NUM_FORMS": "1000",
+            "mothers_children-0-id": "",
+            "mothers_children-0-father": str(father.pk),
+            "mothers_children-0-school": str(school.pk),
+            "mothers_children-0-name": "Mary",
+        }
+        formset = ChildFormSet(instance=mother, data=data, queryset=None)
+        self.assertFalse(formset.is_valid())
+        self.assertEqual(
+            formset.errors,
+            [{"__all__": ["Constraint “unique_parents” is violated."]}],
+        )