Allow two decimal places in cable length, show training item IDs in selectpicker

Will close #540

assets/migrations/0028_alter_asset_length.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.2.19 on 2023-05-24 22:03
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('assets', '0027_asset_nickname'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='asset',
+            name='length',
+            field=models.DecimalField(blank=True, decimal_places=2, help_text='m', max_digits=10, null=True),
+        ),
+    ]

assets/models.py

@@ -135,7 +135,7 @@ class Asset(models.Model, RevisionMixin):
     # Cable assets
     is_cable = models.BooleanField(default=False)
     cable_type = models.ForeignKey(to=CableType, blank=True, null=True, on_delete=models.SET_NULL)
-    length = models.DecimalField(decimal_places=1, max_digits=10,
+    length = models.DecimalField(decimal_places=2, max_digits=10,
                                  blank=True, null=True, help_text='m')
     csa = models.DecimalField(decimal_places=2, max_digits=10,
                               blank=True, null=True, help_text='mm²')
@@ -192,5 +192,5 @@ class Asset(models.Model, RevisionMixin):
         return str(self.asset_id)
 
     @property
-    def name(self):
+    def display_name(self):
         return f"{self.display_id} | {self.description}"