dealing with reverse generic relations

gistfile1.txt

import ast

from django.contrib.contenttypes.models import ContentType
from rest_framework import serializers

from addresses.serializers import AddressSerializer
from users import models


class AddressesField(serializers.RelatedField):
    read_only = False

    def from_native(self, data):
        return ast.literal_eval(data)

    def to_native(self, value):
        return AddressSerializer(value).data


class UserSerializer(serializers.ModelSerializer):
    addresses = AddressesField(many=True, required=False)

    class Meta:
        model = models.User
        fields = ('id', 'username', 'first_name', 'last_name', 'email', 'phone', 'addresses')

    def restore_object(self, attrs, instance=None):
        self._addresses = attrs.pop('addresses')
        return super(UserSerializer, self).restore_object(attrs, instance)

    def save_object(self, obj, **kwargs):
        super(UserSerializer, self).save_object(obj, **kwargs)
        content_type = ContentType.objects.get_for_model(obj)
        for address in self._addresses:
            address.update({
                'content_type': content_type,
                'object_id': obj.id,
            })
            obj.addresses.get_or_create(**address)