Fixes #8377: Fix calculation of absolute cable lengths when specified in fractional units

netbox/dcim/migrations/0144_fix_cable_abs_length.py

@@ -0,0 +1,31 @@
+from django.db import migrations
+
+from utilities.utils import to_meters
+
+
+def recalculate_abs_length(apps, schema_editor):
+    """
+    Recalculate absolute lengths for all cables with a length and length unit defined. Fixes
+    incorrectly calculated values as reported under bug #8377.
+    """
+    Cable = apps.get_model('dcim', 'Cable')
+
+    cables = Cable.objects.filter(length__isnull=False).exclude(length_unit='')
+    for cable in cables:
+        cable._abs_length = to_meters(cable.length, cable.length_unit)
+
+    Cable.objects.bulk_update(cables, ['_abs_length'], batch_size=100)
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('dcim', '0143_remove_primary_for_related_name'),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            code=recalculate_abs_length,
+            reverse_code=migrations.RunPython.noop
+        ),
+    ]

netbox/dcim/tables/cables.py

@@ -45,7 +45,7 @@ class CableTable(BaseTable):
     tenant = TenantColumn()
     length = TemplateColumn(
         template_code=CABLE_LENGTH,
-        order_by='_abs_length'
+        order_by=('_abs_length', 'length_unit')
     )
     color = ColorColumn()
     tags = TagColumn(

netbox/dcim/tables/template_code.py

@@ -9,7 +9,8 @@ LINKTERMINATION = """
 """
 
 CABLE_LENGTH = """
-{% if record.length %}{{ record.length }} {{ record.get_length_unit_display }}{% endif %}
+{% load helpers %}
+{% if record.length %}{{ record.length|simplify_decimal }} {{ record.length_unit }}{% endif %}
 """
 
 CABLE_TERMINATION_PARENT = """