[1.1.X] Fixed #13309 -- Ensure that delete() deletes everything it should...

        # Delete objects in chunks to prevent the list of related objects from

        # becoming too long.

        seen_objs = None

        del_itr = iter(del_query)

        while 1:

            # Collect a chunk of objects to be deleted, and then all the

            # objects that are related to the objects that are to be deleted.

            # The chunking *isn't* done by slicing the del_query because we

            # need to maintain the query cache on del_query (see #12328)

            seen_objs = CollectedObjects(seen_objs)

            for i, obj in izip(xrange(CHUNK_SIZE), del_query):

            for i, obj in izip(xrange(CHUNK_SIZE), del_itr):

                obj._collect_sub_objects(seen_objs)

            if not seen_objs:

import datetime

from django.test import TestCase

from models import Book

class LargeDeleteTests(TestCase):

    def test_large_deletes(self):

        "Regression for #13309 -- if the number of objects > chunk size, deletion still occurs"

        for x in range(300):

            track = Book.objects.create(pagecount=x+100)

        Book.objects.all().delete()

        self.assertEquals(Book.objects.count(), 0)