Options.select_on_save
Determines if Django will use the pre-1.6 django.db.models.Model.save() algorithm. The old algorithm uses SELECT to determine if there is an existing row to be updated. The new algorithm tries an UPDATE directly. In some rare cases the UPDATE of an existing row isn’t visible to Django. An example is the PostgreSQL ON UPDATE trigger which returns NULL. In such cases the new algorithm will end up doing an INSERT even when a row exists in the database.
Usually there is no need to set this attribute. The default is False.
See django.db.models.Model.save() for more about the old and new saving algorithm.
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