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Fixed #18676 -- Allow fast-path deletion of objects

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Objects can be fast-path deleted if there are no signals, and there are
no further cascades. If fast-path is taken, the objects do not need to
be loaded into memory before deletion.

Thanks to Jeremy Dunck, Simon Charette and Alex Gaynor for reviewing
the patch.
This commit is contained in:
Anssi Kääriäinen 2012-09-20 18:51:30 +03:00
parent 3fcca0e947
commit 1cd6e04cd4
13 changed files with 275 additions and 19 deletions
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13
tests/regressiontests/admin_util/tests.py
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@ -17,7 +17,7 @@ from django.utils.formats import localize
from django.utils.safestring import mark_safe
from django.utils import six
from .models import Article, Count, Event, Location
from .models import Article, Count, Event, Location, EventGuide
class NestedObjectsTests(TestCase):
@ -71,6 +71,17 @@ class NestedObjectsTests(TestCase):
# Should not require additional queries to populate the nested graph.
self.assertNumQueries(2, self._collect, 0)
def test_on_delete_do_nothing(self):
"""
Check that the nested collector doesn't query for DO_NOTHING objects.
"""
n = NestedObjects(using=DEFAULT_DB_ALIAS)
objs = [Event.objects.create()]
EventGuide.objects.create(event=objs[0])
with self.assertNumQueries(2):
# One for Location, one for Guest, and no query for EventGuide
n.collect(objs)
class UtilTests(unittest.TestCase):
def test_values_from_lookup_field(self):
"""