Opened 10 years ago

Closed 10 years ago

#24004 closed Bug (invalid)

Can't use only() with latest() if x is in only() and get_latest_by

Reported by: Tom Carrick Owned by: nobody
Component: Database layer (models, ORM) Version: 1.7
Severity: Normal Keywords:
Cc: Triage Stage: Unreviewed
Has patch: no Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description (last modified by Tom Carrick)

model Page(models.Model):
    ...
    last_modified = models.DateField()

    class Meta:
        get_latest_by = 'last_modified'

Suppose I want to get the date of the last modification, I might do something like this:

Page.objects.only('last_modified').latest()

But on trying it, we seem to get stuck copying something until we reach maximum recursion depth.

I don't know if this is a bug or if it's simply not going to work, but if it's the latter, I think it could be documented somewhere.

Attachments (1)

testcase_repro_24004.diff (1.3 KB ) - added by Baptiste Mispelon 10 years ago.

Download all attachments as: .zip

Change History (6)

comment:1 by Tom Carrick, 10 years ago

Description: modified (diff)

comment:2 by Tom Carrick, 10 years ago

Description: modified (diff)

comment:3 by Baptiste Mispelon, 10 years ago

Hi,

I can't seem to be able to reproduce the issue you're describing (I've attached the test case I used as a patch).
Could you also show the traceback you're getting as well as the full composition of your models (or ideally a reduced version of it that still shows the issue).

Thanks!

by Baptiste Mispelon, 10 years ago

Attachment: testcase_repro_24004.diff added

comment:4 by Tom Carrick, 10 years ago

My apologies. After some experimentation, I've determined this only fails when using django-mptt, so I'm going to take the bug to them. Please close this.

comment:5 by Baptiste Mispelon, 10 years ago

Resolution: invalid
Status: newclosed

No worries, thanks for following up.

(For the record, you don't need special permissions to close a ticket)

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