Minor admin improvements

dcc/metadata/admin.py

@@ -6,11 +6,15 @@ from metadata.models import (
 @admin.register(Decoder)
 class DecoderAdmin(admin.ModelAdmin):
     readonly_fields = ('image_thumbnail',)
+    list_display = ('__str__', 'interface')
+    list_filter = ('manufacturer', 'interface')
 
 
 @admin.register(Company)
 class CompanyAdmin(admin.ModelAdmin):
     readonly_fields = ('logo_thumbnail',)
+    list_display = ('name', 'country')
+    list_filter = list_display
 
 
 @admin.register(Manufacturer)

dcc/roster/migrations/0002_alter_rollingstock_address.py

@@ -0,0 +1,18 @@
+# Generated by Django 4.0.2 on 2022-04-01 20:32
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('roster', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='rollingstock',
+            name='address',
+            field=models.SmallIntegerField(blank=True, default=None, null=True),
+        ),
+    ]

dcc/roster/models.py

@@ -23,7 +23,7 @@ class RollingStock(models.Model):
         Tag,
         related_name='rolling_stock',
         blank=True)
-    address = models.SmallIntegerField(default=3, null=True, blank=True)
+    address = models.SmallIntegerField(default=None, null=True, blank=True)
     manufacturer = models.ForeignKey(
         Manufacturer, on_delete=models.CASCADE,
         null=True, blank=True)