Closes #1198: Allow filtering unracked devices on device list

netbox/dcim/forms.py

@@ -821,13 +821,15 @@ class DeviceFilterForm(BootstrapMixin, CustomFieldFilterForm):
     rack_id = FilterChoiceField(
         queryset=Rack.objects.annotate(filter_count=Count('devices')),
         label='Rack',
+        null_option=(0, 'None'),
     )
     role = FilterChoiceField(
         queryset=DeviceRole.objects.annotate(filter_count=Count('devices')),
         to_field_name='slug',
     )
     tenant = FilterChoiceField(
-        queryset=Tenant.objects.annotate(filter_count=Count('devices')), to_field_name='slug',
+        queryset=Tenant.objects.annotate(filter_count=Count('devices')),
+        to_field_name='slug',
         null_option=(0, 'None'),
     )
     manufacturer_id = FilterChoiceField(queryset=Manufacturer.objects.all(), label='Manufacturer')

netbox/templates/dcim/device_list.html

@@ -76,6 +76,7 @@ $(document).ready(function() {
 
             // Update rack options
             rack_list.empty();
+            rack_list.append($("<option></option>").attr("value", "0").text("None"));
             $.ajax({
                 url: netbox_api_path + 'dcim/racks/?limit=500&site=' + selected_sites.join('&site='),
                 dataType: 'json',