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Fixed #15118 - Corrected the deletion-ordering for inherited models. 

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15246 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Carl Meyer 2011-01-19 20:11:56 +00:00
parent ca64a3cb2d
commit 621f48086e
1 changed files with 13 additions and 5 deletions
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18
django/db/models/deletion.py
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@ -64,7 +64,7 @@ class Collector(object):
self.field_updates = {} # {model: {(field, value): set([instances])}}
self.dependencies = {} # {model: set([models])}
def add(self, objs, source=None, nullable=False):
def add(self, objs, source=None, nullable=False, reverse_dependency=False):
"""
Adds 'objs' to the collection of objects to be deleted. If the call is
the result of a cascade, 'source' should be the model that caused it
@ -85,6 +85,8 @@ class Collector(object):
# deleting, and therefore do not affect the order in which objects have
# to be deleted.
if new_objs and source is not None and not nullable:
if reverse_dependency:
source, model = model, source
self.dependencies.setdefault(source, set()).add(model)
return new_objs
@ -108,7 +110,7 @@ class Collector(object):
(field, value), set()).update(objs)
def collect(self, objs, source=None, nullable=False, collect_related=True,
source_attr=None):
source_attr=None, reverse_dependency=False):
"""
Adds 'objs' to the collection of objects to be deleted as well as all
parent instances. 'objs' must be a homogenous iterable collection of
@ -118,9 +120,14 @@ class Collector(object):
If the call is the result of a cascade, 'source' should be the model
that caused it and 'nullable' should be set to True, if the relation
can be null.
"""
new_objs = self.add(objs, source, nullable)
If 'reverse_dependency' is True, 'source' will be deleted before the
current model, rather than after. (Needed for cascading to parent
models, the one case in which the cascade follows the forwards
direction of an FK rather than the reverse direction.)
"""
new_objs = self.add(objs, source, nullable,
reverse_dependency=reverse_dependency)
if not new_objs:
return
model = new_objs[0].__class__
@ -132,7 +139,8 @@ class Collector(object):
parent_objs = [getattr(obj, ptr.name) for obj in new_objs]
self.collect(parent_objs, source=model,
source_attr=ptr.rel.related_name,
collect_related=False)
collect_related=False,
reverse_dependency=True)
if collect_related:
for related in model._meta.get_all_related_objects(include_hidden=True):