Modification de l'enregistrement sur K-Psul

- Passe le calcul du montant d'un achat dans la vue au lieu du clean du
  form
- Corrige le calcul d'un achat et le calcul total du montant de la commande
- Ajoute l'enregistrement du statut COF de la personne associée à la
  commande

La subvention COF, la majoration possible (type concert), autres...
devront être prises en compte donc le calcul d'un achat doit être dans
la vue.
Les achats et les retraits doivent avoir un montant négatif tandis que
les charges ont un montant positif.
L'enregistrement du statut COF servira aux futures statistiques.

kfet/forms.py

@@ -155,7 +155,6 @@ class KPsulOperationForm(forms.ModelForm):
                     "Un achat nécessite un article et une quantité")
             if article_nb < 1:
                 raise ValidationError("Impossible d'acheter moins de 1 article")
-            self.cleaned_data['amount'] = article.price * article_nb
             self.cleaned_data['is_checkout'] = True
         elif type_ope and type_ope in [Operation.DEPOSIT, Operation.WITHDRAW]:
             if not amount or article or article_nb:
@@ -168,5 +167,5 @@ class KPsulOperationForm(forms.ModelForm):
 KPsulOperationFormSet = modelformset_factory(
         Operation,
         form    = KPsulOperationForm,
-        extra   = 0,
+        extra   = 1,
         min_num = 1, validate_min = True)

kfet/migrations/0011_auto_20160807_1720.py

@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('kfet', '0010_auto_20160806_2343'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='operation',
+            name='amount',
+            field=models.DecimalField(decimal_places=2, max_digits=6, default=0, blank=True),
+        ),
+    ]

kfet/views.py

@@ -402,15 +402,24 @@ def kpsul_perform_operations(request):
     if 'errors' in data:
         return JsonResponse(data, status=400)
 
-    # Pre-saving
+    # Pre-saving (no commit)
     operationgroup = operationgroup_form.save(commit = False)
     operations     = operation_formset.save(commit = False)
 
+    # Calculating amount of each PURCHASE operations
+    # and total amount for operation group
     for operation in operations:
+        if operation.type == Operation.PURCHASE:
+            operation.amount = - operation.article.price * operation.article_nb
         operationgroup.amount += operation.amount
-    operationgroup.save()
 
+    # Filling cof status for statistics
+    operationgroup.is_cof = operationgroup.on_acc.is_cof
+    # Saving operation group
+    operationgroup.save()
     data['operationgroup'] = operationgroup.pk
+
+    # Filling operationgroup id for each operations and saving
     for operation in operations:
         operation.group = operationgroup
         operation.save()