Fix deletion of part category and stock location

- Category up part updated to parent
- Location of item updated to parent

InvenTree/stock/migrations/0004_auto_20180414_1032.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11 on 2018-04-14 10:32
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('stock', '0003_auto_20180413_1230'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='stockitem',
+            name='location',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.DO_NOTHING, related_name='items', to='stock.StockLocation'),
+        ),
+    ]

InvenTree/stock/models.py

@@ -11,6 +11,8 @@ from InvenTree.models import InvenTreeTree
 
 from datetime import datetime
 
+from django.db.models.signals import pre_delete
+from django.dispatch import receiver
 
 class StockLocation(InvenTreeTree):
     """ Organization tree for StockItem objects
@@ -24,12 +26,21 @@ class StockLocation(InvenTreeTree):
         return stock_list
 
 
+@receiver(pre_delete, sender=StockLocation, dispatch_uid='stocklocation_delete_log')
+def before_delete_stock_location(sender, instance, using, **kwargs):
+
+    # Update each part in the stock location
+    for item in instance.items.all():
+        item.location = instance.parent
+        item.save()
+
 class StockItem(models.Model):
     part = models.ForeignKey(Part, on_delete=models.CASCADE, related_name='locations')
 
     supplier_part = models.ForeignKey(SupplierPart, blank=True, null=True, on_delete=models.SET_NULL)
 
-    location = models.ForeignKey(StockLocation, on_delete=models.CASCADE)
+    location = models.ForeignKey(StockLocation, on_delete=models.DO_NOTHING,
+                                 related_name='items', blank=True, null=True)
 
     quantity = models.PositiveIntegerField(validators=[MinValueValidator(0)])
 

InvenTree/stock/templates/stock/loc_link.html

@@ -1,4 +1,4 @@
-<div class="container">
+<div class="navigation">
 <a href="/stock/list/">Stock</a> >
 {% if location %}
 {% for path_item in location.parentpath %}