import sys
import os
import gzip
import zipfile
from optparse import make_option
from django.core.management.base import BaseCommand
from django.core.management.color import no_style
try:
set
except NameError:
from sets import Set as set # Python 2.3 fallback
try:
import bz2
has_bz2 = True
except ImportError:
has_bz2 = False
class Command(BaseCommand):
help = 'Installs the named fixture(s) in the database.'
args = "fixture [fixture ...]"
def handle(self, *fixture_labels, **options):
from django.db.models import get_apps
from django.core import serializers
from django.db import connection, transaction
from django.conf import settings
self.style = no_style()
verbosity = int(options.get('verbosity', 1))
show_traceback = options.get('traceback', False)
# commit is a stealth option - it isn't really useful as
# a command line option, but it can be useful when invoking
# loaddata from within another script.
# If commit=True, loaddata will use its own transaction;
# if commit=False, the data load SQL will become part of
# the transaction in place when loaddata was invoked.
commit = options.get('commit', True)
# Keep a count of the installed objects and fixtures
fixture_count = 0
object_count = 0
models = set()
humanize = lambda dirname: dirname and "'%s'" % dirname or 'absolute path'
# Get a cursor (even though we don't need one yet). This has
# the side effect of initializing the test database (if
# it isn't already initialized).
cursor = connection.cursor()
# Start transaction management. All fixtures are installed in a
# single transaction to ensure that all references are resolved.
if commit:
transaction.commit_unless_managed()
transaction.enter_transaction_management()
transaction.managed(True)
class SingleZipReader(zipfile.ZipFile):
def __init__(self, *args, **kwargs):
zipfile.ZipFile.__init__(self, *args, **kwargs)
if settings.DEBUG:
assert len(self.namelist()) == 1, "Zip-compressed fixtures must contain only one file."
def read(self):
return zipfile.ZipFile.read(self, self.namelist()[0])
compression_types = {
None: file,
'gz': gzip.GzipFile,
'zip': SingleZipReader
}
if has_bz2:
compression_types['bz2'] = bz2.BZ2File
app_fixtures = [os.path.join(os.path.dirname(app.__file__), 'fixtures') for app in get_apps()]
for fixture_label in fixture_labels:
parts = fixture_label.split('.')
if len(parts) > 1 and parts[-1] in compression_types:
compression_formats = [parts[-1]]
parts = parts[:-1]
else:
compression_formats = compression_types.keys()
if len(parts) == 1:
fixture_name = parts[0]
formats = serializers.get_public_serializer_formats()
else:
fixture_name, format = '.'.join(parts[:-1]), parts[-1]
if format in serializers.get_public_serializer_formats():
formats = [format]
else:
formats = []
if formats:
if verbosity > 1:
print "Loading '%s' fixtures..." % fixture_name
else:
sys.stderr.write(
self.style.ERROR("Problem installing fixture '%s': %s is not a known serialization format." %
(fixture_name, format)))
transaction.rollback()
transaction.leave_transaction_management()
return
if os.path.isabs(fixture_name):
fixture_dirs = [fixture_name]
else:
fixture_dirs = app_fixtures + list(settings.FIXTURE_DIRS) + ['']
for fixture_dir in fixture_dirs:
if verbosity > 1:
print "Checking %s for fixtures..." % humanize(fixture_dir)
label_found = False
for format in formats:
for compression_format in compression_formats:
if compression_format:
file_name = '.'.join([fixture_name, format,
compression_format])
else:
file_name = '.'.join([fixture_name, format])
if verbosity > 1:
print "Trying %s for %s fixture '%s'..." % \
(humanize(fixture_dir), file_name, fixture_name)
full_path = os.path.join(fixture_dir, file_name)
open_method = compression_types[compression_format]
try:
fixture = open_method(full_path, 'r')
if label_found:
fixture.close()
print self.style.ERROR("Multiple fixtures named '%s' in %s. Aborting." %
(fixture_name, humanize(fixture_dir)))
transaction.rollback()
transaction.leave_transaction_management()
return
else:
fixture_count += 1
objects_in_fixture = 0
if verbosity > 0:
print "Installing %s fixture '%s' from %s." % \
(format, fixture_name, humanize(fixture_dir))
try:
objects = serializers.deserialize(format, fixture)
for obj in objects:
objects_in_fixture += 1
models.add(obj.object.__class__)
obj.save()
object_count += objects_in_fixture
label_found = True
except (SystemExit, KeyboardInterrupt):
raise
except Exception:
import traceback
fixture.close()
transaction.rollback()
transaction.leave_transaction_management()
if show_traceback:
traceback.print_exc()
else:
sys.stderr.write(
self.style.ERROR("Problem installing fixture '%s': %s\n" %
(full_path, ''.join(traceback.format_exception(sys.exc_type,
sys.exc_value, sys.exc_traceback)))))
return
fixture.close()
# If the fixture we loaded contains 0 objects, assume that an
# error was encountered during fixture loading.
if objects_in_fixture == 0:
sys.stderr.write(
self.style.ERROR("No fixture data found for '%s'. (File format may be invalid.)" %
(fixture_name)))
transaction.rollback()
transaction.leave_transaction_management()
return
except Exception, e:
if verbosity > 1:
print "No %s fixture '%s' in %s." % \
(format, fixture_name, humanize(fixture_dir))
# If we found even one object in a fixture, we need to reset the
# database sequences.
if object_count > 0:
sequence_sql = connection.ops.sequence_reset_sql(self.style, models)
if sequence_sql:
if verbosity > 1:
print "Resetting sequences"
for line in sequence_sql:
cursor.execute(line)
if commit:
transaction.commit()
transaction.leave_transaction_management()
if object_count == 0:
if verbosity > 1:
print "No fixtures found."
else:
if verbosity > 0:
print "Installed %d object(s) from %d fixture(s)" % (object_count, fixture_count)
# Close the DB connection. This is required as a workaround for an
# edge case in MySQL: if the same connection is used to
# create tables, load data, and query, the query can return
# incorrect results. See Django #7572, MySQL #37735.
if commit:
connection.close()