Improve road number sorting and enforce company on consists

ram/consist/migrations/0004_alter_consist_company.py

@@ -0,0 +1,20 @@
+# Generated by Django 4.0.6 on 2022-07-15 16:08
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('metadata', '0004_alter_rollingstocktype_options_and_more'),
+        ('consist', '0003_consist_image'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='consist',
+            name='company',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='metadata.company'),
+        ),
+    ]

ram/consist/models.py

@@ -13,9 +13,7 @@ class Consist(models.Model):
     consist_address = models.SmallIntegerField(
         default=None, null=True, blank=True
     )
-    company = models.ForeignKey(
-        Company, on_delete=models.CASCADE, null=True, blank=True
-    )
+    company = models.ForeignKey(Company, on_delete=models.CASCADE)
     era = models.CharField(max_length=32, blank=True)
     image = models.ImageField(upload_to="images/", null=True, blank=True)
     notes = models.TextField(blank=True)