def add_route_capacities(request, race_id):
"""Calculate capacities for all routes in a race."""
race = Race.objects.get(id=race_id)
if race.routes is None:
error = 'no-routes'
return render_to_response('races/add_route_capacities.html', {'error': error, 'race_id': race_id})
r = RaceBuilder()
count = r.addRouteCapacities(race)
return render_to_response('races/add_route_capacities.html', {'count': count, 'race': race})
