How to pass stdout data to stringio?

Question

Django

There is a custom command that calls the dumpdata command. It is necessary to transfer the returned data from this call to stringio, how can I do this?

fake_file = io.StringIO()
call_command('dumpdata', stdout=fake_file)
print(fake_file.read()) #Ноль эффекта

Answer 1

Well, why these crutches? If you need to get json of all project data, use a serializer, as the dumpdata command itself does:

from django.apps import apps
from django.core import serializers

# Получаем список всех моделей всех приложений из INSTALLED_APPS
# и фильтруем django'вские
models = [model for model in apps.get_models() if not model.__module__.startswith('django')]

# Сериалзиуем в json полный QuerySet каждой модели
dump = ''
for m in models:
    dump += serializers.serialize('json', m._default_manager.all())

Answer 2

import subprocess
data = subprocess.check_output('dumpdata')
print(data)