Make migration for backfilling pages' `latest_revision` and revisions' `object_str`

wagtail/migrations/0075_populate_latest_revision_and_revision_object_str.py

@@ -0,0 +1,41 @@
+# Generated by Django 4.0.3 on 2022-05-26 13:58
+
+from django.db import migrations, models
+from django.db.models.functions import Cast
+
+
+def populate_latest_revision(apps, schema_editor):
+    Page = apps.get_model("wagtailcore.Page")
+    Revision = apps.get_model("wagtailcore.Revision")
+    latest_revision_id = models.Subquery(
+        Revision.objects.filter(
+            content_type_id=models.OuterRef("content_type_id"),
+            object_id=Cast(models.OuterRef("pk"), models.CharField()),
+        )
+        .order_by("-created_at", "-id")
+        .values("pk")[:1]
+    )
+    Page.objects.all().update(latest_revision_id=latest_revision_id)
+
+
+def populate_revision_object_str(apps, schema_editor):
+    Revision = apps.get_model("wagtailcore.Revision")
+    Revision.objects.all().update(object_str=models.F("content__title"))
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("wagtailcore", "0074_revision_object_str"),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            populate_latest_revision,
+            migrations.RunPython.noop,
+        ),
+        migrations.RunPython(
+            populate_revision_object_str,
+            migrations.RunPython.noop,
+        ),
+    ]