--Okay, the model I'm using specifies an __eq__ function without a corresponding __hash__ function. I've opened a pull request with the owner of that project.
From: django-users@googlegroups.com [mailto:django-users@googlegroups.com] On Behalf Of Matthew Pava
Sent: Wednesday, April 17, 2019 11:18 AM
To: django-users@googlegroups.com
Subject: RE: Unhashable TypeError when deleted from model, Django 2.2
Hi Sithu,
I would still need to a way determine when a record expires. A Boolean wouldn't help in that regard.
But I think this error has something to do with Django's delete method. The filtering aspect works just fine.
From: django-users@googlegroups.com [mailto:django-users@googlegroups.com] On Behalf Of Sithembewena L. Dube
Sent: Tuesday, April 16, 2019 2:49 PM
To: django-users@googlegroups.com
Subject: Re: Unhashable TypeError when deleted from model, Django 2.2
Why not use a boolean field on the model to denote expires? Then if that field is True, delete the object? I think that would be cheaper and cleaner, especially with lookups.
Kind regards,
Sithu
Sent with Shift
On Tue, Apr 16, 2019 at 9:29 PM Matthew Pava <Matthew.Pava@iss.com> wrote:
I have a model that has a nullable field called expires. If expires is null, then the record never expires.
I'm performing a delete on the model for any record that has an expires date that has passed, and I keep getting a TypeError that Model is unhashable. Am I doing something wrong?
Model.objects.filter(expires__lt=timezone.now()).delete()
Here's the traceback:
Traceback (most recent call last):
File "\django\core\handlers\exception.py", line 34, in inner
response = get_response(request)
File "\django\core\handlers\base.py", line 115, in _get_response
response = self.process_exception_by_middleware(e, request)
File "\django\core\handlers\base.py", line 113, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "\django\views\decorators\csrf.py", line 54, in wrapped_view
return view_func(*args, **kwargs)
File "\django\views\generic\base.py", line 71, in view
return self.dispatch(request, *args, **kwargs)
File "\rest_framework\views.py", line 495, in dispatch
response = self.handle_exception(exc)
File "\rest_framework\views.py", line 455, in handle_exception
self.raise_uncaught_exception(exc)
File "\rest_framework\views.py", line 492, in dispatch
response = handler(request, *args, **kwargs)
File "\rest_framework\decorators.py", line 55, in handler
return func(*args, **kwargs)
File "C:\project\general\views.py", line 88, in all_messages_for_user
Model.objects.filter(expires__lt=timezone.now()).delete()
File "\django\db\models\query.py", line 710, in delete
collector.collect(del_query)
File "\django\db\models\deletion.py", line 192, in collect
reverse_dependency=reverse_dependency)
File "\django\db\models\deletion.py", line 94, in add
if obj not in instances:
TypeError: unhashable type: 'Model'
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