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

[Baptiste Mispelon]

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!

[Tom Carrick]

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.

[Baptiste Mispelon]

No worries, thanks for following up.

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