move _polymorphic_iterator to PolymorphicModelIterable as there is no second compatibility code path anymore

polymorphic/query.py

@@ -20,7 +20,21 @@ from .query_translate import translate_polymorphic_field_path, translate_polymor
 Polymorphic_QuerySet_objects_per_request = 100
 
 
-def _polymorphic_iterator(queryset, base_iter):
+class PolymorphicModelIterable(ModelIterable):
+    """
+    ModelIterable for PolymorphicModel
+
+    Yields real instances if qs.polymorphic_disabled is False,
+    otherwise acts like a regular ModelIterable.
+    """
+
+    def __iter__(self):
+        base_iter = super(PolymorphicModelIterable, self).__iter__()
+        if self.queryset.polymorphic_disabled:
+            return base_iter
+        return self._polymorphic_iterator(base_iter)
+
+    def _polymorphic_iterator(self, base_iter):
         """
         Here we do the same as::
 
@@ -45,7 +59,7 @@ def _polymorphic_iterator(queryset, base_iter):
                     reached_end = True
                     break
 
-        real_results = queryset._get_real_instances(base_result_objects)
+            real_results = self.queryset._get_real_instances(base_result_objects)
 
             for o in real_results:
                 yield o
@@ -54,21 +68,6 @@ def _polymorphic_iterator(queryset, base_iter):
                 return
 
 
-class PolymorphicModelIterable(ModelIterable):
-    """
-    ModelIterable for PolymorphicModel
-
-    Yields real instances if qs.polymorphic_disabled is False,
-    otherwise acts like a regular ModelIterable.
-    """
-
-    def __iter__(self):
-        base_iter = super(PolymorphicModelIterable, self).__iter__()
-        if self.queryset.polymorphic_disabled:
-            return base_iter
-        return _polymorphic_iterator(self.queryset, base_iter)
-
-
 def transmogrify(cls, obj):
     """
     Upcast a class to a different type without asking questions.