Partial merge to do user merging via management command

contributors/management/commands/usermerge.py

+from django.core.management.base import BaseCommand, CommandError
+from contributors.models import User
+import getpass
+import sys
+import logging
+
+log = logging.getLogger(__name__)
+
+
+class Command(BaseCommand):
+    help = 'Merge users'
+
+    def add_arguments(self, parser):
+        parser.add_argument(
+                "--quiet", action="store_true", dest="quiet", default=None,
+                help="Disable progress reporting")
+        parser.add_argument(
+                "--author", action="store", metavar="username", default=getpass.getuser(),
+                help="Username of the user performing this operation")
+        parser.add_argument(
+                "--into", action="store", metavar="dest_username", required=True,
+                help="Destination user that other user(s) are merged into")
+        parser.add_argument(
+                "users", nargs="+", metavar="src_username",
+                help="Users to merge into the destination one")
+
+    def handle(self, into, users, author, quiet=False, *args, **opts):
+        FORMAT = "%(asctime)-15s %(levelname)s %(message)s"
+        if quiet:
+            logging.basicConfig(level=logging.WARNING, stream=sys.stderr, format=FORMAT)
+        else:
+            logging.basicConfig(level=logging.INFO, stream=sys.stderr, format=FORMAT)
+
+        author = User.objects.get(username=author)
+        dest = User.objects.get(username=into)
+        src = [User.objects.get(x) for x in users]
+
+        if dest in src:
+            raise CommandError(f"Cannot merge User {src} into itself")
+
+        for user in src:
+            dest.merge(user, audit_author=author, audit_notes="merged from command line")