#18284: "has_bulk_insert = False" results in only saving one ManyToManyField
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Reporter: manfre | Owner: nobody
Type: Bug | Status: new
Component: Database layer (models, ORM) | Version: 1.4
Severity: Release blocker | Keywords: regression,
Triage Stage: Unreviewed | bulk_insert
Easy pickings: 0 | Has patch: 0
| UI/UX: 0
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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.
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Ticket URL: <https://code.djangoproject.com/ticket/18284>
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