Move decoder interface def into rolling stock

ram/metadata/admin.py

@@ -20,8 +20,8 @@ class PropertyAdmin(admin.ModelAdmin):
 @admin.register(Decoder)
 class DecoderAdmin(admin.ModelAdmin):
     readonly_fields = ("image_thumbnail",)
-    list_display = ("__str__", "interface")
-    list_filter = ("manufacturer", "interface")
+    list_display = ("__str__", "sound")
+    list_filter = ("manufacturer", "sound")
     search_fields = ("name", "manufacturer__name")
 
 

ram/metadata/migrations/0008_remove_decoder_interface.py

@@ -0,0 +1,18 @@
+# Generated by Django 4.1.2 on 2022-10-31 23:01
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("metadata", "0007_rename_track_scale_tracks"),
+        ("roster", "0013_rollingstock_decoder_interface"),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name="decoder",
+            name="interface",
+        ),
+    ]

ram/metadata/models.py

@@ -66,9 +66,6 @@ class Decoder(models.Model):
         limit_choices_to={"category": "model"},
     )
     version = models.CharField(max_length=64, blank=True)
-    interface = models.PositiveSmallIntegerField(
-        choices=settings.DECODER_INTERFACES, null=True, blank=True
-    )
     sound = models.BooleanField(default=False)
     image = models.ImageField(upload_to="images/", null=True, blank=True)