feat(dref): add script to migrate related event to dref

Author: sudip-khanal

dref/management/commands/migrate_event.py

@@ -0,0 +1,28 @@
+from django.core.management.base import BaseCommand
+
+from api.models import Appeal, AppealType
+from dref.models import Dref
+
+
+class Command(BaseCommand):
+    help = "Migrate related Event to Dref"
+
+    def handle(self, *args, **options):
+        self.stdout.write(self.style.NOTICE("Starting migration of events to Dref..."))
+
+        appeal_qs = Appeal.objects.filter(atype=AppealType.DREF).exclude(code__isnull=True)
+
+        appeal_map = {appeal.code: appeal.event for appeal in appeal_qs if appeal.event}
+
+        drefs = Dref.objects.exclude(appeal_code__isnull=True)
+        self.stdout.write(self.style.NOTICE(f"Total Dref records with appeal code:{drefs.count()}"))
+        count = 0
+
+        for dref in drefs:
+            event_id = appeal_map.get(dref.appeal_code)
+            if event_id:
+                dref.event = event_id
+                count += 1
+
+        Dref.objects.bulk_update(drefs, ["event"])
+        self.stdout.write(self.style.SUCCESS(f"Updated {count} Dref records with related Event"))