[5.0.x] Fixed #35159 -- Fixed dumpdata crash when base querysets use prefetch_related().

Regression in 139135627650ed6aaaf4c755b82c3bd43f2b8f51
following deprecation in edbf930287cb72e9afab1f7208c24b1146b0c4ec.

Thanks Andrea F for the report.
Backport of 38eaf2f21a2398a8dd8444f6df3723898cb5fe2a from main

1 files changed, 4 insertions, 1 deletions

diff --git a/django/core/management/commands/dumpdata.py b/django/core/management/commands/dumpdata.py
index cc183517e3..01ff8974dd 100644
--- a/django/core/management/commands/dumpdata.py
+++ b/django/core/management/commands/dumpdata.py
@@ -219,7 +219,10 @@ class Command(BaseCommand):
                     if count_only:
                         yield queryset.order_by().count()
                     else:
-                        yield from queryset.iterator()
+                        chunk_size = (
+                            2000 if queryset._prefetch_related_lookups else None
+                        )
+                        yield from queryset.iterator(chunk_size=chunk_size)
 
         try:
             self.stdout.ending = None