Run migrations! Added data migration for channel aliases

evennia/comms/migrations/0019_auto_20210514_2032.py

@@ -0,0 +1,41 @@
+# Generated by Django 2.2.16 on 2021-05-14 20:32
+
+from django.db import migrations
+
+
+def migrate_channel_aliases(apps, schema_editor):
+    """
+    Note - this migration uses the contemporary ChannelDB rather than
+    the apps.get_model version. This allows for using all the
+    helper functionality, but introduces a dependency on current code. So
+    We catch errors and warn, since this is not something that will be needed
+    after doing the first migration.
+
+    """
+    from evennia.comms.models import ChannelDB
+    # ChannelDB = apps.get_model("comms", "ChannelDB")
+
+    for channel in ChannelDB.objects.all():
+        try:
+            chan_key = channel.db_key.lower()
+            channel_aliases = [chan_key] + [alias.lower() for alias in channel.aliases.all()]
+            for subscriber in channel.subscriptions.all():
+                nicktuples = subscriber.nicks.get(category="channel", return_tuple=True, return_list=True)
+                all_aliases = channel_aliases + [tup[2] for tup in nicktuples if tup[3].lower() == chan_key]
+                for key_or_alias in all_aliases:
+                    channel.add_user_channel_alias(subscriber, key_or_alias)
+        except Exception as err:
+            # we want to continue gracefully here since this is a data-migration from
+            # an old to a new version and doesn't involve schema changes
+            print("channel-alias data migration 0019_auto_20210514_2032 skipped: {err}")
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('comms', '0018_auto_20191025_0831'),
+    ]
+
+    operations = [
+        migrations.RunPython(migrate_channel_aliases)
+    ]