partlist: fix product alignment, add product sum

partdoc/parts/templates/parts/parts.html

@@ -24,5 +24,8 @@
 <tr>
 	<td>Summe:</td>
 	<td>{{len}}</td>
+	{% for product in product_sums %}
+	<td>{{product}}</td>
+	{% endfor %}
 	<td>Teile</td>
 </table>

partdoc/parts/views.py

@@ -1,4 +1,5 @@
 import json
+from collections import defaultdict
 from django.shortcuts import get_object_or_404, render
 from django.http import HttpResponseRedirect, HttpResponse
 from django.urls import reverse
@@ -45,17 +46,16 @@ def parts(request):
 	products = Product.objects.order_by('name')
 	parts = BrandedPart.objects.order_by('number')
 	quantities = []
-	for part in parts:	# FIXME!
-		qtys = part.usage_set.values('productusage__product__name').annotate(Sum('productusage__quantity')).order_by('productusage__product__name')
-		#prod_qtys = {}
-		prod_qtys = []
-		for obj in qtys:
-			# FIXME: make sure there are n(==products) entries
-			#prod_qtys['productusage__product__name'] = obj['productusage__quantity__sum']
-			qty = obj['productusage__quantity__sum']
-			if not qty:
-				qty = 0
-			prod_qtys.append(qty)
+	product_sums = defaultdict(lambda: 0)
+	for part in parts:	# TODO: replace by sophisticated query
+		qtys = defaultdict(lambda: 0)
+		for result in part.usage_set.values('productusage__product__name').annotate(Sum('productusage__quantity')).order_by('productusage__product__name'):
+			prod_name = result['productusage__product__name']
+			prod_sum = result['productusage__quantity__sum']
+			if prod_sum:
+				qtys[prod_name] = prod_sum
+				product_sums[prod_name] += prod_sum
+		prod_qtys = [qtys[prod.name] for prod in products]
 		quantities.append({
 			"name": part.get_name(),
 			"number": part.number,
@@ -64,7 +64,13 @@ def parts(request):
 			"id": part.id,
 		})
 		
-	context = {'products': products, 'parts': parts, 'quantities': quantities, 'len': len(quantities)}
+	context = {
+		'products': products,
+		'parts': parts,
+		'quantities': quantities,
+		'len': len(quantities),
+		'product_sums': [product_sums[prod.name] for prod in products]
+	}
 	return render(request, 'parts/parts.html', context)