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# -*- coding: utf-8 -*-
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"""
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SyncData
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========
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Django command similar to 'loaddata' but also deletes.
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After 'syncdata' has run, the database will have the same data as the fixture - anything
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missing will of been added, anything different will of been updated,
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and anything extra will of been deleted.
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"""
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import os
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from django.apps import apps
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from django.conf import settings
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from django.core import serializers
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from django.core.management.base import BaseCommand, CommandError
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from django.core.management.color import no_style
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from django.db import DEFAULT_DB_ALIAS, connections, transaction
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from django.template.defaultfilters import pluralize
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from django_extensions.management.utils import signalcommand
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def humanize(dirname):
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return "'%s'" % dirname if dirname else 'absolute path'
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class SyncDataError(Exception):
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pass
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class Command(BaseCommand):
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""" syncdata command """
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help = 'Makes the current database have the same data as the fixture(s), no more, no less.'
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args = "fixture [fixture ...]"
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def add_arguments(self, parser):
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super().add_arguments(parser)
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parser.add_argument(
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'--skip-remove', action='store_false', dest='remove', default=True,
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help='Avoid remove any object from db',
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)
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parser.add_argument(
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'--remove-before', action='store_true', dest='remove_before', default=False,
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help='Remove existing objects before inserting and updating new ones',
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)
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parser.add_argument(
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'--database', default=DEFAULT_DB_ALIAS,
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help='Nominates a specific database to load fixtures into. Defaults to the "default" database.',
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)
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parser.add_argument(
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'fixture_labels', nargs='?', type=str,
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help='Specify the fixture label (comma separated)',
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)
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def remove_objects_not_in(self, objects_to_keep, verbosity):
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"""
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Delete all the objects in the database that are not in objects_to_keep.
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- objects_to_keep: A map where the keys are classes, and the values are a
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set of the objects of that class we should keep.
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"""
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for class_ in objects_to_keep.keys():
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current = class_.objects.all()
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current_ids = set(x.pk for x in current)
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keep_ids = set(x.pk for x in objects_to_keep[class_])
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remove_these_ones = current_ids.difference(keep_ids)
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if remove_these_ones:
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for obj in current:
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if obj.pk in remove_these_ones:
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obj.delete()
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if verbosity >= 2:
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print("Deleted object: %s" % str(obj))
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if verbosity > 0 and remove_these_ones:
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num_deleted = len(remove_these_ones)
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if num_deleted > 1:
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type_deleted = str(class_._meta.verbose_name_plural)
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else:
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type_deleted = str(class_._meta.verbose_name)
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print("Deleted %s %s" % (str(num_deleted), type_deleted))
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@signalcommand
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def handle(self, *args, **options):
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self.style = no_style()
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self.using = options['database']
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fixture_labels = options['fixture_labels'].split(',') if options['fixture_labels'] else ()
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try:
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with transaction.atomic():
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self.syncdata(fixture_labels, options)
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except SyncDataError as exc:
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raise CommandError(exc)
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finally:
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# Close the DB connection -- unless we're still in a transaction. This
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# is required as a workaround for an edge case in MySQL: if the same
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# connection is used to create tables, load data, and query, the query
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# can return incorrect results. See Django #7572, MySQL #37735.
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if transaction.get_autocommit(self.using):
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connections[self.using].close()
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def syncdata(self, fixture_labels, options):
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verbosity = options['verbosity']
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show_traceback = options['traceback']
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# Keep a count of the installed objects and fixtures
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fixture_count = 0
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object_count = 0
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objects_per_fixture = []
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models = set()
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# Get a cursor (even though we don't need one yet). This has
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# the side effect of initializing the test database (if
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# it isn't already initialized).
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cursor = connections[self.using].cursor()
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app_modules = [app.module for app in apps.get_app_configs()]
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app_fixtures = [os.path.join(os.path.dirname(app.__file__), 'fixtures') for app in app_modules]
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for fixture_label in fixture_labels:
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parts = fixture_label.split('.')
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if len(parts) == 1:
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fixture_name = fixture_label
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formats = serializers.get_public_serializer_formats()
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else:
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fixture_name, format_ = '.'.join(parts[:-1]), parts[-1]
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if format_ in serializers.get_public_serializer_formats():
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formats = [format_]
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else:
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formats = []
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if formats:
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if verbosity > 1:
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print("Loading '%s' fixtures..." % fixture_name)
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else:
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raise SyncDataError("Problem installing fixture '%s': %s is not a known serialization format." % (fixture_name, format_))
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if os.path.isabs(fixture_name):
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fixture_dirs = [fixture_name]
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else:
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fixture_dirs = app_fixtures + list(settings.FIXTURE_DIRS) + ['']
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for fixture_dir in fixture_dirs:
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if verbosity > 1:
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print("Checking %s for fixtures..." % humanize(fixture_dir))
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label_found = False
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for format_ in formats:
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if verbosity > 1:
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print("Trying %s for %s fixture '%s'..." % (humanize(fixture_dir), format_, fixture_name))
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try:
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full_path = os.path.join(fixture_dir, '.'.join([fixture_name, format_]))
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fixture = open(full_path, 'r')
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if label_found:
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fixture.close()
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raise SyncDataError("Multiple fixtures named '%s' in %s. Aborting." % (fixture_name, humanize(fixture_dir)))
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else:
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fixture_count += 1
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objects_per_fixture.append(0)
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if verbosity > 0:
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print("Installing %s fixture '%s' from %s." % (format_, fixture_name, humanize(fixture_dir)))
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try:
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objects_to_keep = {}
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objects = list(serializers.deserialize(format_, fixture))
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for obj in objects:
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class_ = obj.object.__class__
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if class_ not in objects_to_keep:
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objects_to_keep[class_] = set()
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objects_to_keep[class_].add(obj.object)
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if options['remove'] and options['remove_before']:
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self.remove_objects_not_in(objects_to_keep, verbosity)
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for obj in objects:
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object_count += 1
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objects_per_fixture[-1] += 1
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models.add(obj.object.__class__)
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obj.save()
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if options['remove'] and not options['remove_before']:
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self.remove_objects_not_in(objects_to_keep, verbosity)
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label_found = True
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except (SystemExit, KeyboardInterrupt):
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raise
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except Exception:
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import traceback
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fixture.close()
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if show_traceback:
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traceback.print_exc()
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raise SyncDataError("Problem installing fixture '%s': %s\n" % (full_path, traceback.format_exc()))
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fixture.close()
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except SyncDataError as e:
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raise e
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except Exception:
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if verbosity > 1:
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print("No %s fixture '%s' in %s." % (format_, fixture_name, humanize(fixture_dir)))
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# If any of the fixtures we loaded contain 0 objects, assume that an
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# error was encountered during fixture loading.
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if 0 in objects_per_fixture:
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raise SyncDataError("No fixture data found for '%s'. (File format may be invalid.)" % fixture_name)
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# If we found even one object in a fixture, we need to reset the
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# database sequences.
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if object_count > 0:
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sequence_sql = connections[self.using].ops.sequence_reset_sql(self.style, models)
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if sequence_sql:
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if verbosity > 1:
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print("Resetting sequences")
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for line in sequence_sql:
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cursor.execute(line)
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if object_count == 0:
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if verbosity > 1:
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print("No fixtures found.")
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else:
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if verbosity > 0:
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print("Installed %d object%s from %d fixture%s" % (
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object_count, pluralize(object_count),
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fixture_count, pluralize(fixture_count)
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))
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