Fewer requests on accounts groups.

- Saves two queries.

(4 prefetch where done, replaced by 2 prefetchs (whose 1 with 2
selected_related))

kfet/views.py

@@ -518,13 +518,22 @@ def account_update(request, trigramme):
         'pwd_form': pwd_form,
     })
 
+
 @permission_required('kfet.manage_perms')
 def account_group(request):
-    groups = (Group.objects
+    user_pre = Prefetch(
-        .filter(name__icontains='K-Fêt')
+        'user_set',
-        .prefetch_related('permissions', 'user_set__profile__account_kfet')
+        queryset=User.objects.select_related('profile__account_kfet'),
     )
-    return render(request, 'kfet/account_group.html', { 'groups': groups })
+    groups = (
+        Group.objects
+        .filter(name__icontains='K-Fêt')
+        .prefetch_related('permissions', user_pre)
+    )
+    return render(request, 'kfet/account_group.html', {
+        'groups': groups,
+    })
+
 
 class AccountGroupCreate(SuccessMessageMixin, CreateView):
     model = Group