you can use datetime.datetime.strptime to avoid this error. I resolved it
few days back.
for this you have to import datetime like this: import datetime

On Sat, Jan 22, 2022 at 12:19 PM Lalit Suthar <sutharlalit...@gmail.com>
wrote:

> Fabio C. Barrionuevo da Luz's answer will work like a charm!
>
>
>
> On Fri, 21 Jan 2022 at 21:04, Fabio C. Barrionuevo da Luz <
> bna...@gmail.com> wrote:
>
>> this can be easily solved by using an annotation to calculate the
>> difference and store it in a new temporary column, and then sort by it
>>
>>
>> from django.db.models import F
>> from myapp.models import ExampleModel
>>
>> queryset = ExampleModel.objects.annotate(
>>     dt_difference=F('updated_at') - F('created_at')
>> ).order_by('dt_difference')
>>
>> for example in queryset[:10]:
>>     print(f'created_at={example.created_at} -
>> updated_at={example.updated_at} - dt_difference={example.dt_difference}')
>>
>>
>>
>> Em sex., 21 de jan. de 2022 às 10:54, Gabriel Araya Garcia <
>> gabrielaraya2...@gmail.com> escreveu:
>>
>>> Try this:
>>> ExampleModel.objects.all().order_by('updated_at' , '-created_at')
>>> Gabriel Araya Garcia
>>> GMI - Desarrollo de Sistemas Informáticos
>>>
>>>
>>>
>>>
>>> El vie, 21 ene 2022 a las 1:54, Aadil Rashid (<aadil10121...@gmail.com>)
>>> escribió:
>>>
>>>> class ExampleModel(models.Model):
>>>> is_active = models.BooleanField(default=True)
>>>> created_at = models.DateTimeField(auto_now_add=True)
>>>> updated_at = models.DateTimeField(auto_now=True)
>>>>
>>>>
>>>>
>>>> I want to query on UserModel such that the Query set which I get
>>>> should be orderable in terms of time difference of updated_at - created_at,
>>>> I tried
>>>> ExampleModel.objects.all().order_by('updated_at' - 'created_at')
>>>> but this is not working
>>>> it throws, *TypeError*: unsupported operand type(s) for -: 'str' and
>>>> 'str'
>>>>
>>>>
>>>> Django Family Please Help...................
>>>>
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>>>>
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>>>
>>
>>
>> --
>> Fábio C. Barrionuevo da Luz
>> Palmas - Tocantins - Brasil - América do Sul
>>
>> http://pythonclub.com.br/
>>
>> Blog colaborativo sobre Python e tecnologias Relacionadas, mantido
>> totalmente no https://github.com/pythonclub/pythonclub.github.io .
>>
>> Todos são livres para publicar. É só fazer fork, escrever sua postagem e
>> mandar o pull-request. Leia mais sobre como publicar em README.md e
>> contributing.md.
>> Regra básica de postagem:
>> "Você" acha interessante? É útil para "você"? Pode ser utilizado com
>> Python ou é útil para quem usa Python? Está esperando o que? Publica logo,
>> que estou louco para ler...
>>
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>> <https://groups.google.com/d/msgid/django-users/CAPVjvMYVR1yqZjLuEh5u6DaR5DZfeYqvFy-MaNkt7MiWO7O%2Bxw%40mail.gmail.com?utm_medium=email&utm_source=footer>
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