Action to generate a json document with all objects and related objects

admin_actions.py

# -*- coding: utf-8 -*-
__author__ = 'esauro'
from django.core import serializers
from django.db.models.deletion import Collector
from django.http import HttpResponse
from django.db import router


def export_related_as_json(modeladmin, request, qs):
    """Serializes the selected queryset and all related objects to JSON"""
    response = HttpResponse(mimetype="text/plain")

    # TODO: This should calculate the database instead of using "default"
    collector = Collector(using = router.db_for_read(modeladmin.model))
    collector.collect(qs)
    serializers.serialize("json",
                          [o for m,o in collector.instances_with_model()],
                          stream = response,
                          indent = 4,
            )
    return response