Add a migration to ensure EmailAddress model populated

Many users on production have User.email set with no corresponding email address model

Fix migration should assume emails are not verified

Fix migration typo

itou/users/migrations/0015_ensure_emailaddress_model_use.py

@@ -0,0 +1,38 @@
+from django.db import migrations
+from django.db.models import OuterRef, Subquery
+
+
+def create_email_addresses_for_users(apps, schema_editor):
+    User = apps.get_model("users", "User")
+    EmailAddress = apps.get_model("account", "EmailAddress")
+
+    # Get all those values of User.email where there is no corresponding EmailAddresses instance
+    users_missing_addresses = (
+        User.objects.prefetch_related("emailaddress_set")
+        .annotate(email_exists=Subquery(EmailAddress.objects.filter(email=OuterRef("email")).values("id")[:1]))
+        .filter(email_exists__isnull=True)
+        .values("id", "email")
+    )
+
+    EmailAddress.objects.bulk_create(
+        EmailAddress(user_id=x["id"], email=x["email"], primary=True, verified=False) for x in users_missing_addresses
+    )
+
+
+class Migration(migrations.Migration):
+    """
+    This migration was created at a time when not all User email addresses had an associated EmailAddress.
+    It ensures that EmailAddress instances are created where they are not existing.
+    Of course this means that the migration can be squashed later.
+    """
+
+    dependencies = [
+        ("users", "0014_alter_jobseekerprofile_birthdate__add_index"),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            create_email_addresses_for_users,
+            reverse_code=migrations.RunPython.noop,
+        ),
+    ]