Detects what models were used in a django fixture

fixture_models.py

#!/usr/bin/env python
import json
import sys

# useful when used with backticks like: python manage.py dumpdata --indent=4 `fixture_models your_fixture.json`

data = None

with open(sys.argv[1]) as json_file:
    data = json.load(json_file)

models = set()

for model in data:
    models.add(model['model'])

print ' '.join(models)