serialization update mothod overloading in django code example

Example 1: User serializer in django rest framework

from rest_framework import serializers

class PostSerializer(serializers.ModelSerializer):
    user = serializers.PrimaryKeyRelatedField(read_only=True, default=serializers.CurrentUserDefault())
    class Meta:
        model = Post

Example 2: how to add methods to manuplate the model in serializers

from django.db import models
from django.contrib.auth.models import User

class UnivStudent(models.Model):
    """
    A class based model for storing the records of a university student
    Note: A OneToOne relation is established for each student with User model.
    """
    user = models.OneToOneField(User)
    subject_major = models.CharField(name="subject_major", max_length=60)

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