Writable hybrid of PrimaryKeyRelated and SerializerMethod Fields

hybrid_field.py

from rest_framework import serializers


class HybridPrimaryKeyRelatedAndSerializerMethodField(serializers.PrimaryKeyRelatedField):
    """
    PrimaryKeyRelatedField & SerializerMethodField
    """
    def __init__(self, method_name=None, **kwargs):
        self.method_name = method_name
        super(HybridPrimaryKeyRelatedAndSerializerMethodField, self).__init__(**kwargs)

    def to_representation(self, value):
        """
        Transform the *outgoing* native value into primitive data.
        """
        method = getattr(self.parent, self.method_name)
        return method(value)