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
12172	Improve save() handling of deferred fields	miracle2k	nobody	"Currently, when saving a model instance with deferred fields, all the missing fields are first pulled, one query each. This is not only very inefficient, of course, it also restricts the number of possible uses of the defer mechanism.

For example, django-denorm needs to do an additional query when saving a model with cache-fields  to ensure that a potentially more recent value in the db is not overridden with a stale value on the field. If a field could just be excluded from save(), that would not be necessary.

I'm not familiar with the Django ORM code, but wouldn't it be straightforward to just skip fields that are not yet loaded during a save()?"		closed	Database layer (models, ORM)	1.1		duplicate			Unreviewed	0	0	0	0	0	0