Fixed #36426 -- Added support for further iterables in prefetch_related_objects().

Thanks Sarah Boyce for the review.

tests/prefetch_related/test_prefetch_related_objects.py

@@ -1,3 +1,5 @@
+from collections import deque
+
 from django.db.models import Prefetch, prefetch_related_objects
 from django.test import TestCase
 
@@ -221,3 +223,32 @@ class PrefetchRelatedObjectsTests(TestCase):
 
         with self.assertNumQueries(0):
             self.assertCountEqual(book1.authors.all(), [self.author1, self.author2])
+
+    def test_prefetch_related_objects_with_various_iterables(self):
+        book = self.book1
+
+        class MyIterable:
+            def __iter__(self):
+                yield book
+
+        cases = {
+            "set": {book},
+            "tuple": (book,),
+            "dict_values": {"a": book}.values(),
+            "frozenset": frozenset([book]),
+            "deque": deque([book]),
+            "custom iterator": MyIterable(),
+        }
+        for case_type, case in cases.items():
+            with self.subTest(case=case_type):
+                # Clear the prefetch cache.
+                book._prefetched_objects_cache = {}
+                with self.assertNumQueries(1):
+                    prefetch_related_objects(case, "authors")
+                with self.assertNumQueries(0):
+                    self.assertCountEqual(
+                        book.authors.all(), [self.author1, self.author2, self.author3]
+                    )
+
+    def test_prefetch_related_objects_empty(self):
+        prefetch_related_objects([], "authors")