Add sorting, enforce foreign keys

ram/roster/migrations/0007_alter_rollingclass_company_alter_rollingclass_type.py

@@ -0,0 +1,25 @@
+# Generated by Django 4.0.6 on 2022-07-15 15:24
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('metadata', '0004_alter_rollingstocktype_options_and_more'),
+        ('roster', '0006_alter_rollingclassproperty_rolling_class_and_more'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='rollingclass',
+            name='company',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='metadata.company'),
+        ),
+        migrations.AlterField(
+            model_name='rollingclass',
+            name='type',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='metadata.rollingstocktype'),
+        ),
+    ]