Re: order_by on the basis of time difference (updated_at - created_at)

Thank you very much Django family for your positive response, and especially to @Fabio C. Barrionuevo da Luz, 

Adding another field to the QuerySet using the "annotate"  function really helped and solves the problem like a charm! as side by @Lalit Suthar

Thank you once again everyone for sharing valuable information here; 

I learned a lot from your sujjections.

On Sun, Jan 23, 2022 at 12:17 PM DJANGO DEVELOPER <abubakarbryar@gmail.com> wrote:

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.97@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 <bnafta@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 <gabrielaraya2011@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 (<aadil10121998@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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Fábio C. Barrionuevo da Luz
Palmas - Tocantins - Brasil - América do Sul

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