dav_registration: added filter function to select single sport

dav_registration/views.py

@@ -8,6 +8,7 @@ from django.urls import reverse_lazy
 from django.utils.translation import ugettext as _
 from django.views import generic
 
+from dav_events.choices import SPORT_CHOICES
 from dav_events.models.event import Event
 
 from .forms import RegistrationForm
@@ -44,6 +45,19 @@ class EventListView(generic.ListView):
 
         return qs
 
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+        if hasattr(self, 'init_sport_filter'):
+            context['init_sport_filter'] = self.init_sport_filter
+        return context
+
+    def get(self, request, *args, **kwargs):
+        if 'sport' in request.GET:
+            sport = request.GET['sport']
+            if (sport, 'Bogus') in SPORT_CHOICES:
+                self.init_sport_filter = sport
+        return super().get(request, *args, **kwargs)
+
 
 class EventDetailView(generic.DetailView):
     model = Event