195 lines
8.3 KiB
Python
195 lines
8.3 KiB
Python
import warnings
|
|
from collections import OrderedDict
|
|
|
|
from django.apps import apps
|
|
from django.core import serializers
|
|
from django.core.management.base import BaseCommand, CommandError
|
|
from django.core.management.utils import parse_apps_and_model_labels
|
|
from django.db import DEFAULT_DB_ALIAS, router
|
|
|
|
|
|
class ProxyModelWarning(Warning):
|
|
pass
|
|
|
|
|
|
class Command(BaseCommand):
|
|
help = (
|
|
"Output the contents of the database as a fixture of the given format "
|
|
"(using each model's default manager unless --all is specified)."
|
|
)
|
|
|
|
def add_arguments(self, parser):
|
|
parser.add_argument(
|
|
'args', metavar='app_label[.ModelName]', nargs='*',
|
|
help='Restricts dumped data to the specified app_label or app_label.ModelName.',
|
|
)
|
|
parser.add_argument(
|
|
'--format', default='json',
|
|
help='Specifies the output serialization format for fixtures.',
|
|
)
|
|
parser.add_argument(
|
|
'--indent', type=int,
|
|
help='Specifies the indent level to use when pretty-printing output.',
|
|
)
|
|
parser.add_argument(
|
|
'--database',
|
|
default=DEFAULT_DB_ALIAS,
|
|
help='Nominates a specific database to dump fixtures from. '
|
|
'Defaults to the "default" database.',
|
|
)
|
|
parser.add_argument(
|
|
'-e', '--exclude', action='append', default=[],
|
|
help='An app_label or app_label.ModelName to exclude '
|
|
'(use multiple --exclude to exclude multiple apps/models).',
|
|
)
|
|
parser.add_argument(
|
|
'--natural-foreign', action='store_true', dest='use_natural_foreign_keys',
|
|
help='Use natural foreign keys if they are available.',
|
|
)
|
|
parser.add_argument(
|
|
'--natural-primary', action='store_true', dest='use_natural_primary_keys',
|
|
help='Use natural primary keys if they are available.',
|
|
)
|
|
parser.add_argument(
|
|
'-a', '--all', action='store_true', dest='use_base_manager',
|
|
help="Use Django's base manager to dump all models stored in the database, "
|
|
"including those that would otherwise be filtered or modified by a custom manager.",
|
|
)
|
|
parser.add_argument(
|
|
'--pks', dest='primary_keys',
|
|
help="Only dump objects with given primary keys. Accepts a comma-separated "
|
|
"list of keys. This option only works when you specify one model.",
|
|
)
|
|
parser.add_argument(
|
|
'-o', '--output',
|
|
help='Specifies file to which the output is written.'
|
|
)
|
|
|
|
def handle(self, *app_labels, **options):
|
|
format = options['format']
|
|
indent = options['indent']
|
|
using = options['database']
|
|
excludes = options['exclude']
|
|
output = options['output']
|
|
show_traceback = options['traceback']
|
|
use_natural_foreign_keys = options['use_natural_foreign_keys']
|
|
use_natural_primary_keys = options['use_natural_primary_keys']
|
|
use_base_manager = options['use_base_manager']
|
|
pks = options['primary_keys']
|
|
|
|
if pks:
|
|
primary_keys = [pk.strip() for pk in pks.split(',')]
|
|
else:
|
|
primary_keys = []
|
|
|
|
excluded_models, excluded_apps = parse_apps_and_model_labels(excludes)
|
|
|
|
if not app_labels:
|
|
if primary_keys:
|
|
raise CommandError("You can only use --pks option with one model")
|
|
app_list = OrderedDict.fromkeys(
|
|
app_config for app_config in apps.get_app_configs()
|
|
if app_config.models_module is not None and app_config not in excluded_apps
|
|
)
|
|
else:
|
|
if len(app_labels) > 1 and primary_keys:
|
|
raise CommandError("You can only use --pks option with one model")
|
|
app_list = OrderedDict()
|
|
for label in app_labels:
|
|
try:
|
|
app_label, model_label = label.split('.')
|
|
try:
|
|
app_config = apps.get_app_config(app_label)
|
|
except LookupError as e:
|
|
raise CommandError(str(e))
|
|
if app_config.models_module is None or app_config in excluded_apps:
|
|
continue
|
|
try:
|
|
model = app_config.get_model(model_label)
|
|
except LookupError:
|
|
raise CommandError("Unknown model: %s.%s" % (app_label, model_label))
|
|
|
|
app_list_value = app_list.setdefault(app_config, [])
|
|
|
|
# We may have previously seen a "all-models" request for
|
|
# this app (no model qualifier was given). In this case
|
|
# there is no need adding specific models to the list.
|
|
if app_list_value is not None:
|
|
if model not in app_list_value:
|
|
app_list_value.append(model)
|
|
except ValueError:
|
|
if primary_keys:
|
|
raise CommandError("You can only use --pks option with one model")
|
|
# This is just an app - no model qualifier
|
|
app_label = label
|
|
try:
|
|
app_config = apps.get_app_config(app_label)
|
|
except LookupError as e:
|
|
raise CommandError(str(e))
|
|
if app_config.models_module is None or app_config in excluded_apps:
|
|
continue
|
|
app_list[app_config] = None
|
|
|
|
# Check that the serialization format exists; this is a shortcut to
|
|
# avoid collating all the objects and _then_ failing.
|
|
if format not in serializers.get_public_serializer_formats():
|
|
try:
|
|
serializers.get_serializer(format)
|
|
except serializers.SerializerDoesNotExist:
|
|
pass
|
|
|
|
raise CommandError("Unknown serialization format: %s" % format)
|
|
|
|
def get_objects(count_only=False):
|
|
"""
|
|
Collate the objects to be serialized. If count_only is True, just
|
|
count the number of objects to be serialized.
|
|
"""
|
|
models = serializers.sort_dependencies(app_list.items())
|
|
for model in models:
|
|
if model in excluded_models:
|
|
continue
|
|
if model._meta.proxy and model._meta.proxy_for_model not in models:
|
|
warnings.warn(
|
|
"%s is a proxy model and won't be serialized." % model._meta.label,
|
|
category=ProxyModelWarning,
|
|
)
|
|
if not model._meta.proxy and router.allow_migrate_model(using, model):
|
|
if use_base_manager:
|
|
objects = model._base_manager
|
|
else:
|
|
objects = model._default_manager
|
|
|
|
queryset = objects.using(using).order_by(model._meta.pk.name)
|
|
if primary_keys:
|
|
queryset = queryset.filter(pk__in=primary_keys)
|
|
if count_only:
|
|
yield queryset.order_by().count()
|
|
else:
|
|
yield from queryset.iterator()
|
|
|
|
try:
|
|
self.stdout.ending = None
|
|
progress_output = None
|
|
object_count = 0
|
|
# If dumpdata is outputting to stdout, there is no way to display progress
|
|
if output and self.stdout.isatty() and options['verbosity'] > 0:
|
|
progress_output = self.stdout
|
|
object_count = sum(get_objects(count_only=True))
|
|
stream = open(output, 'w') if output else None
|
|
try:
|
|
serializers.serialize(
|
|
format, get_objects(), indent=indent,
|
|
use_natural_foreign_keys=use_natural_foreign_keys,
|
|
use_natural_primary_keys=use_natural_primary_keys,
|
|
stream=stream or self.stdout, progress_output=progress_output,
|
|
object_count=object_count,
|
|
)
|
|
finally:
|
|
if stream:
|
|
stream.close()
|
|
except Exception as e:
|
|
if show_traceback:
|
|
raise
|
|
raise CommandError("Unable to serialize database: %s" % e)
|