Add "enabled" field to Label class

- Only list labels which are enabled
- Allows labels to be hidden / disabled without being deleted

InvenTree/label/admin.py

@@ -8,7 +8,7 @@ from .models import StockItemLabel
 
 class StockItemLabelAdmin(admin.ModelAdmin):
 
-    list_display = ('name', 'description', 'label')
+    list_display = ('name', 'description', 'label', 'filters', 'enabled')
 
 
 admin.site.register(StockItemLabel, StockItemLabelAdmin)

InvenTree/label/migrations/0002_stockitemlabel_enabled.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.0.7 on 2020-08-22 23:04
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('label', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='stockitemlabel',
+            name='enabled',
+            field=models.BooleanField(default=True, help_text='Label template is enabled', verbose_name='Enabled'),
+        ),
+    ]

InvenTree/label/models.py

@@ -70,6 +70,12 @@ class LabelTemplate(models.Model):
         validators=[validateFilterString]
     )
 
+    enabled = models.BooleanField(
+        default=True,
+        help_text=_('Label template is enabled'),
+        verbose_name=_('Enabled')
+    )
+
     def get_record_data(self, items):
         """
         Return a list of dict objects, one for each item.

InvenTree/stock/views.py

@@ -310,7 +310,8 @@ class StockItemSelectLabels(AjaxView):
 
         labels = []
 
-        for label in StockItemLabel.objects.all():
+        # Construct a list of StockItemLabel objects which are enabled, and the filters match the selected StockItem
+        for label in StockItemLabel.objects.filter(enabled=True):
             if label.matches_stock_item(item):
                 labels.append(label)