Use int sort for road numbers

ram/roster/migrations/0009_alter_rollingstock_options_and_more.py

@@ -0,0 +1,41 @@
+# Generated by Django 4.0.6 on 2022-07-16 15:38
+
+import re
+from django.db import migrations, models
+
+
+def gen_road_number_cleaned(apps, schema_editor):
+    RollingStock = apps.get_model('roster', 'RollingStock')
+    for row in RollingStock.objects.all():
+        try:
+            row.road_number_int = int(re.findall(r"\d+", row.road_number)[0])
+            row.save(update_fields=['road_number_int'])
+        except IndexError:
+            pass
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('roster', '0008_rollingstock_road_number_cleaned'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='rollingstock',
+            options={'ordering': ['rolling_class', 'road_number_int'], 'verbose_name_plural': 'Rolling stock'},
+        ),
+        migrations.RemoveField(
+            model_name='rollingstock',
+            name='road_number_cleaned',
+        ),
+        migrations.AddField(
+            model_name='rollingstock',
+            name='road_number_int',
+            field=models.PositiveSmallIntegerField(default=0),
+        ),
+        migrations.RunPython(
+            gen_road_number_cleaned,
+            reverse_code=migrations.RunPython.noop
+        ),
+    ]