#32450: "TypeError: cannot pickle" when applying | operator to a Q object
-------------------------------------+-------------------------------------
Reporter: Daniel Izquierdo | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 3.1
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Description changed by Daniel Izquierdo:
Old description:
> Using a reference to a non-pickleable type of object such as `dict_keys`
> in a `Q` object makes the `|` operator fail:
>
> {{{
> >>> from django.db.models import Q
> >>> Q(x__in={}.keys())
> <Q: (AND: ('x__in', dict_keys([])))>
> >>> Q() | Q(x__in={}.keys())
> Traceback (most recent call last):
> ...
> TypeError: cannot pickle 'dict_keys' object
> }}}
>
> Even though this particular example could be solved by doing `Q() |
> Q(x__in={})` it still feels like doing using `.keys()` should work.
>
> I can work on a patch if there's agreement that this should not crash.
New description:
Using a reference to a non-pickleable type of object such as `dict_keys`
in a `Q` object makes the `|` operator fail:
{{{
>>> from django.db.models import Q
>>> Q(x__in={}.keys())
<Q: (AND: ('x__in', dict_keys([])))>
>>> Q() | Q(x__in={}.keys())
Traceback (most recent call last):
...
TypeError: cannot pickle 'dict_keys' object
}}}
Even though this particular example could be solved by doing `Q() |
Q(x__in={})` it still feels like using `.keys()` should work.
I can work on a patch if there's agreement that this should not crash.
--
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Ticket URL: <https://code.djangoproject.com/ticket/32450#comment:1>
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