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Refactored workhorse methods on m2m descriptors. Modified _add to check for the type of incoming objects (to match existing _remove implementation), and modified _remove to use a single query rather than 1 per object (to match existing _add implementation). 

git-svn-id: http://code.djangoproject.com/svn/django/trunk@4233 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Russell Keith-Magee 2006-12-20 14:06:27 +00:00
parent e859f108f1
commit 64a2718f6c
1 changed files with 18 additions and 10 deletions
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28
django/db/models/fields/related.py
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@ -319,6 +319,10 @@ def create_many_related_manager(superclass):
# If there aren't any objects, there is nothing to do.
if objs:
# Check that all the objects are of the right type
for obj in objs:
if not isinstance(obj, self.model):
raise ValueError, "objects to add() must be %s instances" % self.model._meta.object_name
# Add the newly created or already existing objects to the join table.
# First find out which items are already added, to avoid adding them twice
new_ids = set([obj._get_pk_val() for obj in objs])
@ -345,16 +349,20 @@ def create_many_related_manager(superclass):
# *objs - objects to remove
from django.db import connection
for obj in objs:
if not isinstance(obj, self.model):
raise ValueError, "objects to remove() must be %s instances" % self.model._meta.object_name
# Remove the specified objects from the join table
cursor = connection.cursor()
for obj in objs:
cursor.execute("DELETE FROM %s WHERE %s = %%s AND %s = %%s" % \
(self.join_table, source_col_name, target_col_name),
[self._pk_val, obj._get_pk_val()])
transaction.commit_unless_managed()
# If there aren't any objects, there is nothing to do.
if objs:
# Check that all the objects are of the right type
for obj in objs:
if not isinstance(obj, self.model):
raise ValueError, "objects to remove() must be %s instances" % self.model._meta.object_name
# Remove the specified objects from the join table
old_ids = set([obj._get_pk_val() for obj in objs])
cursor = connection.cursor()
cursor.execute("DELETE FROM %s WHERE %s = %%s AND %s IN (%s)" % \
(self.join_table, source_col_name,
target_col_name, ",".join(['%s'] * len(old_ids))),
[self._pk_val] + list(old_ids))
transaction.commit_unless_managed()
def _clear_items(self, source_col_name):
# source_col_name: the PK colname in join_table for the source object