#31475: Recursion issue when deleting related objects
-------------------------------------+-------------------------------------
Reporter: Matt Drew | Owner: nobody
Type: Bug | Status: closed
Component: Database layer | Version: 3.0
(models, ORM) |
Severity: Normal | Resolution: invalid
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Changes (by Simon Charette):
* status: new => closed
* resolution: => invalid
Comment:
Duplicate of #31435.
In short your code never supported field deferring and was causing silent
queries on model initialization.
e.g.
{{{#!python
list(ClassB.objects.only('pk'))
}}}
Was causing `2N+1` database queries where `N = ClassB.objects.count()`.
There's more details in the linked issue but you should be overriding
`from_db` to achieve this purpose or use `self.__dict__.get` to account
for the fact the field might be deferred.
--
Ticket URL: <https://code.djangoproject.com/ticket/31475#comment:1>
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