Reduced tree time with some better queries

InvenTree/part/api.py

@@ -34,6 +34,11 @@ class PartCategoryTree(TreeSerializer):
     def root_url(self):
         return reverse('part-index')
 
+    def get_items(self):
+
+        print("hello world")
+        return PartCategory.objects.all().prefetch_related('parts', 'children')
+
 
 class CategoryList(generics.ListCreateAPIView):
     """ API endpoint for accessing a list of PartCategory objects.

InvenTree/part/models.py

@@ -69,13 +69,20 @@ class PartCategory(InvenTreeTree):
         return self.partcount
 
     @property
-    def partcount(self):
+    def partcount(self, cascade=True, active=True):
         """ Return the total part count under this category
         (including children of child categories)
         """
 
-        return len(Part.objects.filter(category__in=self.getUniqueChildren(),
-                                       active=True))
+        if cascade:
+            query = Part.objects.filter(category__in=self.getUniqueChildren())
+        else:
+            query = Part.objects.filter(category=self)
+
+        if active:
+            query = query.filter(active=True)
+
+        return query.count()
 
     @property
     def has_parts(self):