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check for changed model fields in djnago signal

@receiver(post_save, sender=Mode)
def post_save(sender, instance, created, **kwargs):
    if not created:
        for item in iter(kwargs.get('update_fields')):
            if item == 'field_name' and instance.field_name == "some_value":
               # do something here

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check for changed model fields in djnago signal

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