Display count badges in sidenav tree

Uses the 'tags' parameter as according to the docs - https://github.com/jonmiles/bootstrap-treeview

- Part
- Stock

InvenTree/InvenTree/models.py

@@ -41,6 +41,17 @@ class InvenTreeTree(models.Model):
                                null=True,
                                related_name='children')
 
+    @property
+    def item_count(self):
+        """ Return the number of items which exist *under* this node in the tree.
+
+        Here an 'item' is considered to be the 'leaf' at the end of each branch,
+        and the exact nature here will depend on the class implementation.
+        
+        The default implementation returns zero
+        """
+        return 0
+
     def getUniqueParents(self, unique=None):
         """ Return a flat set of all parent items that exist above this node.
         If any parents are repeated (which would be very bad!), the process is halted

InvenTree/InvenTree/views.py

@@ -33,6 +33,7 @@ class TreeSerializer(views.APIView):
         data = {
             'text': item.name,
             'href': item.get_absolute_url(),
+            'tags': [item.item_count],
         }
 
         if item.has_children:
@@ -51,12 +52,16 @@ class TreeSerializer(views.APIView):
 
         nodes = []
 
+        top_count = 0
+
         for item in top_items:
             nodes.append(self.itemToJson(item))
+            top_count += item.item_count
 
         top = {
             'text': self.title,
             'nodes': nodes,
+            'tags': [top_count],
         }
 
         response = {

InvenTree/part/models.py

@@ -47,18 +47,17 @@ class PartCategory(InvenTreeTree):
         verbose_name = "Part Category"
         verbose_name_plural = "Part Categories"
 
+    @property
+    def item_count(self):
+        return self.partcount
+
     @property
     def partcount(self):
         """ Return the total part count under this category
         (including children of child categories)
         """
 
-        count = self.parts.count()
-
-        for child in self.children.all():
-            count += child.partcount
-
-        return count
+        return len(Part.objects.filter(category__in=self.getUniqueChildren()))
 
     @property
     def has_parts(self):

InvenTree/static/script/inventree/sidenav.js

@@ -9,7 +9,8 @@ function loadTree(url, tree, data) {
             if (response.tree) {
                 $(tree).treeview({
                     data: response.tree,
-                    enableLinks: true
+                    enableLinks: true,
+                    showTags: true,
                 });
 
                 var saved_exp = sessionStorage.getItem('inventree-sidenav-expanded-items').split(",");

InvenTree/stock/models.py

@@ -48,6 +48,18 @@ class StockLocation(InvenTreeTree):
             }
         )
 
+    @property
+    def stock_item_count(self):
+        """ Return the number of StockItem objects which live in or under this category
+        """
+
+        return len(StockItem.objects.filter(location__in=self.getUniqueChildren()))
+
+    @property
+    def item_count(self):
+
+        return self.stock_item_count
+
 
 @receiver(pre_delete, sender=StockLocation, dispatch_uid='stocklocation_delete_log')
 def before_delete_stock_location(sender, instance, using, **kwargs):