django1/django/core/management/commands/dumpdata.py

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from django.core.management.base import BaseCommand, CommandError
from optparse import make_option
class Command(BaseCommand):
option_list = BaseCommand.option_list + (
make_option('--format', default='json', dest='format',
help='Specifies the output serialization format for fixtures'),
make_option('--indent', default=None, dest='indent', type='int',
help='Specifies the indent level to use when pretty-printing output'),
)
help = 'Output the contents of the database as a fixture of the given format.'
args = '[appname ...]'
def handle(self, *app_labels, **options):
from django.db.models import get_app, get_apps, get_models
from django.core import serializers
format = options.get('format', 'json')
indent = options.get('indent', None)
if len(app_labels) == 0:
app_list = get_apps()
else:
app_list = [get_app(app_label) for app_label in app_labels]
# Check that the serialization format exists; this is a shortcut to
# avoid collating all the objects and _then_ failing.
try:
serializers.get_serializer(format)
except KeyError:
raise CommandError("Unknown serialization format: %s" % format)
objects = []
for app in app_list:
for model in get_models(app):
objects.extend(model.objects.all())
try:
return serializers.serialize(format, objects, indent=indent)
except Exception, e:
raise CommandError("Unable to serialize database: %s" % e)