fix checkout data error on k-psul

kfet/views.py

@@ -841,34 +841,40 @@ def account_read_json(request):
         'trigramme': account.trigramme }
     return JsonResponse(data)
 
+
 @teamkfet_required
 def kpsul_checkout_data(request):
     pk = request.POST.get('pk', 0)
     if not pk:
         pk = 0
-    data = (Checkout.objects
-        .annotate(
-            last_statement_by_first_name=F('statements__by__profile__user__first_name'),
-            last_statement_by_last_name=F('statements__by__profile__user__last_name'),
-            last_statement_by_trigramme=F('statements__by__trigramme'),
-            last_statement_balance=F('statements__balance_new'),
-            last_statement_at=F('statements__at'))
-        .values(
-            'id', 'name', 'balance', 'valid_from', 'valid_to',
-            'last_statement_balance', 'last_statement_at',
-            'last_statement_by_trigramme', 'last_statement_by_last_name',
-            'last_statement_by_first_name')
-        .select_related(
-            'statements'
-            'statements__by',
-            'statements__by__profile__user')
-        .filter(pk=pk)
-        .order_by('statements__at')
-        .last())
-    if data is None:
-        raise Http404
+
+    checkout = get_object_or_404(Checkout, pk=pk)
+    data = {
+        'id': checkout.id, 'name': checkout.name, 'balance': checkout.balance,
+        'valid_from': checkout.valid_from, 'valid_to': checkout.valid_to
+    }
+
+    try:
+        last_statement = (
+            CheckoutStatement
+            .objects
+            .select_related('by', 'by__profile', 'by__profile__user')
+            .filter(checkout=checkout)
+            .latest('at')
+        )
+        data['last_statement_balance'] = last_statement.balance_new
+        data['last_statement_at'] = last_statement.at
+        data['last_statement_by_trigramme'] = last_statement.by.trigramme
+        data['last_statement_by_last_name'] = \
+            last_statement.by.profile.user.last_name
+        data['last_statement_by_first_name'] = \
+            last_statement.by.profile.user.first_name
+    except CheckoutStatement.DoesNotExist:
+        pass
+
     return JsonResponse(data)
 
+
 @teamkfet_required
 def kpsul_update_addcost(request):
     addcost_form = AddcostForm(request.POST)