nk20-scripts/management/commands/syncsql.py

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# Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
# SPDX-License-Identifier: GPL-3.0-or-later
from django.core.management.base import BaseCommand
from django.apps import apps
from django.db import connection
from polymorphic.models import PolymorphicModel
NO_SEQ = [
"Session",
"Token",
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"WEIRole", # dirty fix
]
class Command(BaseCommand):
"""
Command to synchronise primary sequence of postgres after bulk insert of django.
"""
def add_arguments(self,parser):
parser.add_argument('apps', type=str,nargs='*',help='applications which table would be resynchronized')
return parser
def handle(self, *args, **kwargs):
app_list = kwargs["apps"]
if len(app_list):
model_classes = list()
for app in app_list:
model_classes += apps.get_app_config(app).get_models()
else:
# no app specified, sync everything
model_classes = apps.get_models(include_auto_created=True)
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db_names = [
m._meta.db_table for m in model_classes
if m.__base__.__base__ is not PolymorphicModel and m.__name__ not in NO_SEQ and m.objects.count() > 1
]
com = "BEGIN;\n"
for db_name in db_names:
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com += f'SELECT setval(pg_get_serial_sequence(\'"{db_name}"\',\'id\'), coalesce(max("id"), 1),' \
f' max("id") IS NOT null) FROM "{db_name}";\n'
com += "COMMIT;"
print(com)
cur = connection.cursor()
cur.execute(com)
cur.close()