[Fixed]-Django Rest Framework, default serializer for foreign key field

Try this

class MyPrimaryKeyRelatedField(PrimaryKeyRelatedField)

    def to_representation(self, value):
        if self.pk_field is not None:
            return self.pk_field.to_representation(value.pk)
        return {"id": value.pk}

Update

class MyModelSerializer(serializers.ModelSerializer)
    serializer_related_field = MyPrimaryKeyRelatedField

Then replace PrimaryKeyRelatedField to MyPrimaryKeyRelatedField and
serializers.ModelSerializer to MyModelSerializer