Custom aggregation of Part API

- Reduced full part query from 2.5s to 200ms!

InvenTree/part/api.py

@@ -6,6 +6,9 @@ Provides a JSON API for the Part app
 from __future__ import unicode_literals
 
 from django_filters.rest_framework import DjangoFilterBackend
+from django.conf import settings
+
+from django.db.models import Sum
 
 from rest_framework import status
 from rest_framework.response import Response
@@ -15,6 +18,8 @@ from rest_framework import generics, permissions
 from django.conf.urls import url, include
 from django.urls import reverse
 
+import os
+
 from .models import Part, PartCategory, BomItem, PartStar
 
 from .serializers import PartSerializer, BomItemSerializer
@@ -99,6 +104,61 @@ class PartList(generics.ListCreateAPIView):
 
     serializer_class = PartSerializer
 
+    def list(self, request, *args, **kwargs):
+        """
+        Instead of using the DRF serialiser to LIST,
+        we serialize the objects manuually.
+        This turns out to be significantly faster.
+        """
+
+        queryset = self.filter_queryset(self.get_queryset())
+
+        data = queryset.values(
+            'pk',
+            'category',
+            'image',
+            'name',
+            'IPN',
+            'description',
+            'keywords',
+            'is_template',
+            'URL',
+            'units',
+            'trackable',
+            'assembly',
+            'component',
+            'salable',
+            'active',
+        ).annotate(
+            in_stock=Sum('stock_items__quantity'),
+        )
+
+        # TODO - Annotate total being built
+        # TODO - Annotate total on order
+        # TODO - Annotate 
+
+        # Reduce the number of lookups we need to do for the part categories
+        categories = {}
+
+        for item in data:
+
+            if item['image']:
+                item['image'] = os.path.join(settings.MEDIA_URL, item['image'])
+
+            cat_id = item['category']
+
+            if cat_id:
+                if cat_id not in categories:
+                    categories[cat_id] = PartCategory.objects.get(pk=cat_id).pathstring
+
+                item['category__name'] = categories[cat_id]
+            else:
+                item['category__name'] = None
+
+
+        return Response(data)
+        
+
     def get_queryset(self):
 
         # Does the user wish to filter by category?

InvenTree/static/script/inventree/part.js

@@ -112,16 +112,25 @@ function loadPartTable(table, url, options={}) {
     }
 
     columns.push({
-        field: 'full_name',
+        field: 'name',
         title: 'Part',
         sortable: true,
         formatter: function(value, row, index, field) {
 
-            if (row.is_template) {
+            var name = '';
-                value = '<i>' + value + '</i>';
+
+            if (row.IPN) {
+                name += row.IPN;
+                name += ' | ';
             }
 
-            var display = imageHoverIcon(row.image_url) + renderLink(value, row.url);
+            name += value;
+
+            if (row.is_template) {
+                name = '<i>' + name + '</i>';
+            }
+
+            var display = imageHoverIcon(row.image) + renderLink(name, '/part/' + row.pk + '/');
             
             if (!row.active) {
                 display = display + "<span class='label label-warning' style='float: right;'>INACTIVE</span>";
@@ -146,11 +155,11 @@ function loadPartTable(table, url, options={}) {
     
     columns.push({
         sortable: true,
-        field: 'category_name',
+        field: 'category__name',
         title: 'Category',
         formatter: function(value, row, index, field) {
             if (row.category) {
-                return renderLink(row.category_name, "/part/category/" + row.category + "/");
+                return renderLink(row.category__name, "/part/category/" + row.category + "/");
             }
             else {
                 return '';
@@ -159,13 +168,13 @@ function loadPartTable(table, url, options={}) {
     });
 
     columns.push({
-        field: 'total_stock',
+        field: 'in_stock',
         title: 'Stock',
         searchable: false,
         sortable: true,
         formatter: function(value, row, index, field) {
             if (value) {
-                return renderLink(value, row.url + 'stock/');
+                return renderLink(value, '/part/' + row.pk + '/stock/');
             }
             else {
                 return "<span class='label label-warning'>No Stock</span>";