'm trying to send a post_save signal after saving an instance through DRF
ModelViewSet create api.
To send the signal only when a particular field is changed, I'm comparing
its value with its original value inside signal as suggested here
<https://stackoverflow.com/questions/1355150/django-when-saving-how-can-you-check-if-a-field-has-changed>
like
below.
if instance._Modelname__original_fieldname != instance.fieldname:
send a mail.
While when saving the model from Django admin, the above code is able to
detect the change in values of the given field, the same code is showing
same values for instance.fieldname and
instance._Modelname__original_fieldname. Hence the mail is not getting sent
when saving the model through api.
I've overridden the init and save methods in my model to enable the change
detection of a field as below.
def __init__(self, *args, **kwargs):
super(Model, self).__init__(*args, **kwargs)
self.__original_fieldname = self.fieldname
def save(self, force_insert=False, force_update=False, *args, **kwargs):
super(Model, self).save(force_insert, force_update, *args, **kwargs)
self.__original_fieldname = self.fieldname
Why DRF is behaving differently for the same piece of code which django is
running smoothly.
and If not as above, then how can I detect change in a field and send a
signal, after DRF api save.
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