Improve road number sorting and enforce company on consists

ram/roster/migrations/0008_rollingstock_road_number_cleaned.py

@@ -0,0 +1,34 @@
+# Generated by Django 4.0.6 on 2022-07-15 15:55
+
+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():
+        row.road_number_cleaned = row.road_number.lstrip('#').lstrip('0')
+        row.save(update_fields=['road_number_cleaned'])
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('roster', '0007_alter_rollingclass_company_alter_rollingclass_type'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='rollingstock',
+            name='road_number_cleaned',
+            field=models.CharField(default='', max_length=128),
+            preserve_default=False,
+        ),
+        migrations.RunPython(
+            gen_road_number_cleaned,
+            reverse_code=migrations.RunPython.noop
+        ),
+        migrations.AlterModelOptions(
+            name='rollingstock',
+            options={'ordering': ['rolling_class', 'road_number_cleaned'], 'verbose_name_plural': 'Rolling stock'},
+        ),
+    ]

ram/roster/models.py

@@ -2,9 +2,9 @@ import os
 from uuid import uuid4
 from django.db import models
 from django.urls import reverse
+from django.dispatch import receiver
 
 # from django.core.files.storage import FileSystemStorage
-# from django.dispatch import receiver
 
 from ram.utils import get_image_preview
 from metadata.models import (
@@ -75,6 +75,7 @@ class RollingStock(models.Model):
         verbose_name="Class",
     )
     road_number = models.CharField(max_length=128, unique=False)
+    road_number_cleaned = models.CharField(max_length=128, unique=False)
     manufacturer = models.ForeignKey(
         Manufacturer,
         on_delete=models.CASCADE,
@@ -99,7 +100,7 @@ class RollingStock(models.Model):
     updated_time = models.DateTimeField(auto_now=True)
 
     class Meta:
-        ordering = ["rolling_class", "road_number"]
+        ordering = ["rolling_class", "road_number_cleaned"]
         verbose_name_plural = "Rolling stock"
 
     def __str__(self):
@@ -115,6 +116,11 @@ class RollingStock(models.Model):
         return str(self.rolling_class.company)
 
 
+@receiver(models.signals.pre_save, sender=RollingStock)
+def pre_save_running_number(sender, instance, *args, **kwargs):
+    instance.road_number_cleaned = instance.road_number.lstrip("#").lstrip("0")
+
+
 class RollingStockDocument(models.Model):
     rolling_stock = models.ForeignKey(
         RollingStock, on_delete=models.CASCADE, related_name="document"