Changeset 4428

Timestamp:

01/25/07 05:24:17 (2 years ago)

Author:

russellm

Message:

Fixed #3215, #3081, #2749 -- Fixed problem with mistaken deletion of objects when a GenericRelation? is involved. Thanks to Thomas Steinacher for helping to narrow down the problem (#3215), and Alex Dedul (#3081) for the starting point of a working patch.

Files:

• django/trunk/django/db/models/query.py (modified) (2 diffs)
• django/trunk/tests/modeltests/generic_relations/models.py (modified) (2 diffs)

django/trunk/django/db/models/query.py

@@ -1 +1 @@
-from django.db import backend, connection, transaction
-from django.db.models.fields import DateField, FieldDoesNotExist
+from django.db.models.fields.generic import GenericRelation
-from django.db.models import signals
-from django.dispatch import dispatcher
@@ -980 +981 @@
-        pk_list = [pk for pk,instance in seen_objs[cls]]
-        for related in cls._meta.get_all_related_many_to_many_objects():
+            if not isinstance(related.field, GenericRelation):
+                for offset in range(0, len(pk_list), GET_ITERATOR_CHUNK_SIZE):
+                    cursor.execute("DELETE FROM %s WHERE %s IN (%s)" % \
+                        (qn(related.field.m2m_db_table()),
+                            qn(related.field.m2m_reverse_name()),
+                            ','.join(['%s' for pk in pk_list[offset:offset+GET_ITERATOR_CHUNK_SIZE]])),
+                        pk_list[offset:offset+GET_ITERATOR_CHUNK_SIZE])
+        for f in cls._meta.many_to_many:
+            if isinstance(f, GenericRelation):
+                from django.contrib.contenttypes.models import ContentType 
+                query_extra = 'AND %s=%%s' % f.rel.to._meta.get_field(f.content_type_field_name).column
+                args_extra = [ContentType.objects.get_for_model(cls).id]
+            else:
+                query_extra = ''
+                args_extra = []
-            for offset in range(0, len(pk_list), GET_ITERATOR_CHUNK_SIZE):
-
-
-
-
-
-
-
-
+
-                    (qn(f.m2m_db_table()), qn(f.m2m_column_name()),
-
-
+) + query_extra
+ + args_extra
-        for field in cls._meta.fields:
-            if field.rel and field.null and field.rel.to in seen_objs:

django/trunk/tests/modeltests/generic_relations/models.py

@@ -66 +66 @@
-# Objects with declared GenericRelations can be tagged directly -- the API
-# mimics the many-to-many API.
+>>> bacon.tags.create(tag="fatty")
+<TaggedItem: fatty>
+>>> bacon.tags.create(tag="salty")
+<TaggedItem: salty>
->>> lion.tags.create(tag="yellow")
-<TaggedItem: yellow>
->>> lion.tags.create(tag="hairy")
-<TaggedItem: hairy>
->>> bacon.tags.create(tag="fatty")
-<TaggedItem: fatty>
->>> bacon.tags.create(tag="salty")
-<TaggedItem: salty>
-
->>> lion.tags.all()
@@ -106 +106 @@
->>> TaggedItem.objects.filter(content_type__pk=ctype.id, object_id=quartz.id)
-[<TaggedItem: clearish>]
+
+# If you delete an object with an explicit Generic relation, the related
+# objects are deleted when the source object is deleted.
+# Original list of tags:
+>>> [(t.tag, t.content_type, t.object_id) for t in TaggedItem.objects.all()]
+[('clearish', <ContentType: mineral>, 1), ('fatty', <ContentType: vegetable>, 2), ('hairy', <ContentType: animal>, 1), ('salty', <ContentType: vegetable>, 2), ('shiny', <ContentType: animal>, 2), ('yellow', <ContentType: animal>, 1)]
+
+>>> lion.delete()
+>>> [(t.tag, t.content_type, t.object_id) for t in TaggedItem.objects.all()]
+[('clearish', <ContentType: mineral>, 1), ('fatty', <ContentType: vegetable>, 2), ('salty', <ContentType: vegetable>, 2), ('shiny', <ContentType: animal>, 2)]
+
+# If Generic Relation is not explicitly defined, any related objects 
+# remain after deletion of the source object.
+>>> quartz.delete()
+>>> [(t.tag, t.content_type, t.object_id) for t in TaggedItem.objects.all()]
+[('clearish', <ContentType: mineral>, 1), ('fatty', <ContentType: vegetable>, 2), ('salty', <ContentType: vegetable>, 2), ('shiny', <ContentType: animal>, 2)]
+
+# If you delete a tag, the objects using the tag are unaffected 
+# (other than losing a tag)
+>>> tag = TaggedItem.objects.get(id=1)
+>>> tag.delete()
+>>> bacon.tags.all()
+[<TaggedItem: salty>]
+>>> [(t.tag, t.content_type, t.object_id) for t in TaggedItem.objects.all()]
+[('clearish', <ContentType: mineral>, 1), ('salty', <ContentType: vegetable>, 2), ('shiny', <ContentType: animal>, 2)]
+
-"""}