Remove sorting on relationship columns

Sorting on manufacturer/model/location/status requires
a join which removes the row with empty field.
Disable it until we find a way to sort properly including null values.

app/inventory/views.py

@@ -73,14 +73,7 @@ def retrieve_items():
                'status',
                'parent',
                )
-    field = getattr(models.Item, columns[order_column])
-    if 4 < order_column < 9:
-        query = query.join(field)
-        relationship_class = getattr(models, columns[order_column].title())
-        relationship_field = getattr(relationship_class, 'name')
-        query = query.order_by(order_dir(relationship_field))
-    else:
-        query = query.order_by(order_dir(getattr(models.Item, columns[order_column])))
+    query = query.order_by(order_dir(getattr(models.Item, columns[order_column])))
     # Limit and offset the query
     if per_page != -1:
         query = query.limit(per_page)

app/static/js/items.js

@@ -64,6 +64,10 @@ $(document).ready(function() {
         "visible": false,
         "searchable": false
       },
+      {
+        "targets": [5, 6, 7, 8],
+        "orderable": false
+      },
       {
         "targets": [1, 9],
         "render": function(data, type, row) {