society-self-service/ssmembership/management/commands/find_duplicate_members.py

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# Society Self-Service
# Copyright © 2018-2020 Yingtong Li (RunasSudo)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
from django.core.management.base import BaseCommand, CommandError
from ssmembership.models import Member
from django.db.models import Count
class Command(BaseCommand):
help = 'Finds members with duplicate emails'
def handle(self, *args, **options):
duplicates = Member.objects.values('email').annotate(email_count=Count('email')).filter(email_count__gt=1)
for d in duplicates:
print(d.email)