#32704: QuerySet.defer() doesn't clear deferred field when chaining with only().
-------------------------------------+-------------------------------------
Reporter: Manuel Baclet | Owner: David
| Wobrock
Type: Bug | Status: assigned
Component: Database layer | Version: 3.1
(models, ORM) |
Severity: Normal | Resolution:
Keywords: defer only | Triage Stage: Accepted
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Changes (by David Wobrock):
* cc: David Wobrock (added)
* owner: nobody => David Wobrock
* has_patch: 0 => 1
* status: new => assigned
Comment:
Hey all,
Replying to [comment:6 Mariusz Felisiak]:
> Replying to [comment:5 Manuel Baclet]:
> >
> > With your patch proposal, i do not think that:
> > `Company.objects.only("name").defer("name").defer("country")` is
equivalent to `Company.objects.only("name").defer("name", "country")`
>
> Did you check this? with proposed patch `country` is the only deferred
fields in both cases. As far as I'm aware that's an intended behavior.
I believe Manuel is right. This happens because the set difference in one
direction gives you the empty set that will clear out the deferred fields
- but it is missing the fact that we might also be adding more `defer`
fields than we had `only` fields in the first place, so that we actually
switch from an `.only()` to a `.defer()` mode.
See the corresponding PR that should fix this behaviour
https://github.com/django/django/pull/14667
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Ticket URL: <https://code.djangoproject.com/ticket/32704#comment:8>
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