Fix infinite recursion on github editing of pr #279

Fixes: 89632483a7

polymorphic/query.py

@@ -35,27 +35,26 @@ def _polymorhic_iterator(queryset, base_iter):
     but it requests the objects in chunks from the database,
     with Polymorphic_QuerySet_objects_per_request per chunk
     """
-    while True:
+    # Make sure the base iterator is read in chunks instead of
+    # reading it completely, in case our caller read only a few objects.
+    for i in range(Polymorphic_QuerySet_objects_per_request):
         base_result_objects = []
         reached_end = False
 
-        # Make sure the base iterator is read in chunks instead of
+        try:
-        # reading it completely, in case our caller read only a few objects.
+            o = next(base_iter)
-        for i in range(Polymorphic_QuerySet_objects_per_request):
+            base_result_objects.append(o)
-            try:
+        except StopIteration:
-                o = next(base_iter)
+            reached_end = True
-                base_result_objects.append(o)
+            break
-            except StopIteration:
-                reached_end = True
-                break
 
-            real_results = queryset._get_real_instances(base_result_objects)
+        real_results = queryset._get_real_instances(base_result_objects)
 
-            for o in real_results:
+        for o in real_results:
-                yield o
+            yield o
 
-            if reached_end:
+        if reached_end:
-                return
+            return
 
 
 if django.VERSION >= (1, 9):