Filtre les participants dans la requête SQL

Et non plus en python

bda/views.py

@@ -5,6 +5,7 @@ from __future__ import division
 from django.shortcuts import render, get_object_or_404
 from django.contrib.auth.decorators import login_required
 from django.db import models
+from django.db.models import Count
 from django.core import serializers
 from django.forms.models import inlineformset_factory
 import hashlib
@@ -329,9 +330,10 @@ class SpectacleListView(ListView):
 @buro_required
 def unpaid(request, tirage_id):
     tirage = get_object_or_404(Tirage, id=tirage_id)
-    unpaid = tirage.participant_set.filter(paid=False).all()
-    really_unpaid = [part for part in unpaid if part.attribution_set.all()]
-    return render(request, "bda-unpaid.html", {"unpaid": really_unpaid})
+    unpaid = tirage.participant_set \
+            .annotate(nb_attributions=Count('attribution')) \
+            .filter(paid=False, nb_attributions__gt=0).all()
+    return render(request, "bda-unpaid.html", {"unpaid": unpaid})
 
 @buro_required                   
 def liste_spectacles_ics(request, tirage_id):