Ajoute des filtres sur la page description.

Les variables `GET` `location` et `category` permettent de filtrer sur
les salles et catégories dans le résultats de `/bda/descriptions/<id>`

bda/views.py

@@ -10,6 +10,7 @@ from django.db import models
 from django.db.models import Count
 from django.core import serializers
 from django.forms.models import inlineformset_factory
+from django.http import HttpResponseBadRequest
 import hashlib
 
 from django.core.mail import send_mail
@@ -368,5 +369,15 @@ def send_rappel(request, spectacle_id):
 
 def descriptions_spectacles(request, tirage_id):
     tirage = get_object_or_404(Tirage, id=tirage_id)
-    shows = tirage.spectacle_set.all()
-    return render(request, 'descriptions.html', {'shows': shows})
+    shows_qs = tirage.spectacle_set
+    category_name = request.GET.get('category', '')
+    location_id = request.GET.get('location', '')
+    if category_name:
+        shows_qs = shows_qs.filter(category__name=category_name)
+    if location_id:
+        try:
+            shows_qs = shows_qs.filter(location__id=int(location_id))
+        except ValueError:
+            return HttpResponseBadRequest(
+                    "La variable GET 'location' doit contenir un entier")
+    return render(request, 'descriptions.html', {'shows': shows_qs.all()})