Refs #27377 -- Fixed reverse query name clash in test model.

tests/modeladmin/models.py

@@ -36,7 +36,7 @@ class ValidationTestModel(models.Model):
     is_active = models.BooleanField(default=False)
     pub_date = models.DateTimeField()
     band = models.ForeignKey(Band, models.CASCADE)
-    best_friend = models.OneToOneField(User, models.CASCADE)
+    best_friend = models.OneToOneField(User, models.CASCADE, related_name='best_friend')
     # This field is intentionally 2 characters long (#16080).
     no = models.IntegerField(verbose_name="Number", blank=True, null=True)