impossible without workarounds to see which fields changed when subscribing to signals from generic views

[MaxR]

for example I have simple generic view:

#views.py
class CollectorUpdate(generic.UpdateView):
    model = ReportBase
    fields = ['title', 'db', 'additionalPath', 'start_date', 'end_date', 'reportTimestamp',
              'updMethod', 'cronStr', 'code', 'code_renew']
    template_name = 'collector/collector_update_form.html'

and subscribe to post_save signal:

@receiver(signal=signals.post_save, sender=ReportBase)
def runCron(sender, **kwargs):
    """Signal handler. Run cron after post_save signal on """
    collector = kwargs.get('instance')
    updated_fields = kwargs.get('update_fields')

but updated_fields always is None

I think the problem is that in generic.UpdateView into .save() method it is necessary to register a field field_update with interesting for me fields.
As workaround i'm using an instyance of saved object:

 collector = kwargs.get('instance')

but it's looks strange and it is inconvenient. I have to do a lot of extra work

[Carlton Gibson]

This is the expected behaviour (​as documented).

As per ​Specifying which fields to save the saved fields are only limited if you pass update_fields, otherwise it's all, so you don't need it in post_save.

If you want to pass update_fields, override your form's save() accordingly.