Re: getting unique id

On Wed, Nov 23, 2022 at 1:43 PM Shaheed Haque <shaheedhaque@gmail.com> wrote:
>
> Are all the threads in the same Python process?

No

> Or the same machine?

No

> Do they have to persist across process (or machine) restarts?

Yes.

Playing around with using F() but still don't have it working as desired.

> On Wed, 23 Nov 2022, 16:57 Larry Martell, <larry.martell@gmail.com> wrote:
>>
>> I have an app that needs to get a unique ID. Many threads run at the
>> same time that need one. I would like the IDs to be sequential. When I
>> need a unique ID I do this:
>>
>> with transaction.atomic():
>> max_batch_id =
>> JobStatus.objects.select_for_update(nowait=False).aggregate(Max('batch_id'))
>> json_dict['batch_id'] = max_batch_id['batch_id__max'] + 1
>> status_row = JobStatus(**json_dict)
>> status_row.save()
>>
>> But multiple jobs are getting the same ID. Why does the code not work
>> as I expect? What is a better way to accomplish what I need?

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