[Python] Django Error Message From django.db Models To Admin

I'm using DRF to create an API backend. Now, I want to enforce certain validation rules while saving the models from the admin. I'm using viewset and can override when called from the rest framework. But when I validate model by overriding the save() method, it can't send any error message to the admin as it doesn't have any request parameter. The scenario is like this:

from django.db import models

class PatientCaregiver(models.Model):
name = models.CharField(max_length=200, null=True, blank=True)
email = models.CharField(max_length=200, null=True, blank=True)

def save(self, *args, **kwargs):
# do some processing
# return some error or success msg(how?)


I know that I can send the error message with the following code:

from django.contrib import messages
messages.error(request,'Error message')


But as you can see, in my save() model, I don't have the request parameter. So, how to send any error message from the save() model to the admin?

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