Question: I am trying to use the `call_command` method to call the dumpdata `command`. Manually, I use it as follows to save the data to a file.

```
python manage.py dumpdata appname_one appname_two > /path/to/save/file.json

```

and it saves the json file. Now, I am in a situation where I need to call this command using the `call_command` method.

I am able to print out the json from the command using the following:

```
from django.core.management import call_command

call_command('dumpdata', 'appname_one', 'appname_two')

```

Is there a way I can save the given data to a file like we do it from the command line?

Answer: 
An even better way is to use Django's built-in stdout redirection for their command modules. See [docs here](https://docs.djangoproject.com/en/stable/ref/django-admin/#output-redirection).

If you want to manipulate the stream before sending it to a file, you can also pass it a StringIO buffer:

```
import os
from cStringIO import StringIO

from django.core import management

def create_fixture(app_name, filename):
    buf = StringIO()
    management.call_command('dumpdata', app_name, stdout=buf)
    buf.seek(0)
    with open(filename, 'w') as f:
        f.write(buf.read())

```
I am using Django fixture magic <https://github.com/davedash/django-fixture-magic> and need to dump a custom fixture. I tried several ways but ended up using Amyth's answer becuase it was the only way that worked.

Here is my admin action that works with fixture magic

```
def export_survey(modeladmin, request, queryset):

    sysout = sys.stdout

    survey = queryset[0]
    fname = "%s.json" %(survey.slug)
    response = HttpResponse(mimetype='application/json')
    response['Content-Disposition'] = 'attachment; filename=%s' %(fname)

    sys.stdout = response
    call_command('custom_dump', 'complete_survey', survey.id)
    sys.stdout = sysout
    return response

export_survey.short_description = "Exports a single survey as a .json file"

```