[3.2.x] Fixed #32947 -- Fixed hash() crash on reverse M2M relation when through_fields is a list.

Regression in c32d8f33d8e988a376e44997b8f3606d821f305e.

Backport of 20226fcd461670334646f78a0c4d133e439b12b2 from main

1 files changed, 9 insertions, 2 deletions

diff --git a/tests/m2m_through/tests.py b/tests/m2m_through/tests.py
index 6262596dd0..36644c3b59 100644
--- a/tests/m2m_through/tests.py
+++ b/tests/m2m_through/tests.py
@@ -6,8 +6,8 @@ from django.test import TestCase
 
 from .models import (
     CustomMembership, Employee, Event, Friendship, Group, Ingredient,
-    Invitation, Membership, Person, PersonSelfRefM2M, Recipe, RecipeIngredient,
-    Relationship, SymmetricalFriendship,
+    Invitation, Membership, Person, PersonChild, PersonSelfRefM2M, Recipe,
+    RecipeIngredient, Relationship, SymmetricalFriendship,
 )
 
 
@@ -20,6 +20,13 @@ class M2mThroughTests(TestCase):
         cls.rock = Group.objects.create(name='Rock')
         cls.roll = Group.objects.create(name='Roll')
 
+    def test_reverse_inherited_m2m_with_through_fields_list_hashable(self):
+        reverse_m2m = Person._meta.get_field('events_invited')
+        self.assertEqual(reverse_m2m.through_fields, ['event', 'invitee'])
+        inherited_reverse_m2m = PersonChild._meta.get_field('events_invited')
+        self.assertEqual(inherited_reverse_m2m.through_fields, ['event', 'invitee'])
+        self.assertEqual(hash(reverse_m2m), hash(inherited_reverse_m2m))
+
     def test_retrieve_intermediate_items(self):
         Membership.objects.create(person=self.jim, group=self.rock)
         Membership.objects.create(person=self.jane, group=self.rock)