Added a migration to create missing DocAlias instances (and remove some bad ones).

- Legacy-Id: 18511

ietf/doc/migrations/0037_clean_up_missing_docaliases.py

@@ -0,0 +1,34 @@
+# Generated by Django 2.2.16 on 2020-09-22 07:58
+
+import sys
+import debug
+
+from django.db import migrations
+
+
+def forward(apps, schema_editor):
+    Document = apps.get_model('doc', 'Document')
+    DocAlias = apps.get_model('doc', 'DocAlias')
+
+    docs_without_alias = Document.objects.filter(docalias__isnull=True)
+    debug.show('docs_without_alias.count()')
+
+    bad_aliases = DocAlias.objects.filter(name__in=docs_without_alias.values_list('name'))
+    debug.show('bad_aliases.count()')
+    bad_aliases.delete()
+
+    for doc in docs_without_alias:
+        DocAlias.objects.create(name=doc.name).docs.add(doc)
+
+def reverse(apps, schema_editor):
+    pass
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('doc', '0036_orgs_vs_repos'),
+    ]
+
+    operations = [
+        migrations.RunPython(forward, reverse),
+    ]