id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
18284	"""has_bulk_insert = False"" results in only saving one ManyToManyField"	Michael Manfre	nobody	"Attempts to save multiple values for a ManyToManyField will only save one. It appears to follow the same pattern for bulk insert; delete all for parent record followed by a single insert. The form collects and passing down the appropriate clean_data, but only the first value is inserted in to the database.

This is a regression that will cause data errors for 3rd party db backends that have not (or cannot) enable the ''has_bulk_insert = True'' database feature. The core backends are unaffected because they have enabled the feature.

Discovered issue by using django-mssql. It'll no longer an issue as of django-mssql>=1.1a2. Version 1.1a1 added django 1.4 support, so no one should be using it on production yet. It's possible this regression only impacts django-mssql, but the SQLInsertCompiler is mostly a pass through to core.

A quick source check for django-pyodbc and ibm_db_django show that they have not enabled the feature."	Bug	closed	Database layer (models, ORM)	1.4	Release blocker	invalid	regression, bulk_insert		Unreviewed	0	0	0	0	0	0