Fix #1246 Ajusta valor inicial de numero_ordem em ExpedienteMateriaCrud

.CreateView.get_initial para o (ultimo numero_ordem +1).

Signed-off-by: Eliseu Egewarth <eliseuegewarth@gmail.com>

sapl/sessao/views.py

@@ -6,7 +6,7 @@ from django.contrib.auth.decorators import permission_required
 from django.contrib.auth.mixins import PermissionRequiredMixin
 from django.core.exceptions import MultipleObjectsReturned, ObjectDoesNotExist
 from django.core.urlresolvers import reverse
-from django.db.models import Q
+from django.db.models import Max, Q
 from django.forms.utils import ErrorList
 from django.http import JsonResponse
 from django.http.response import Http404, HttpResponseRedirect
@@ -409,6 +409,9 @@ class ExpedienteMateriaCrud(MasterDetailCrud):
         def get_initial(self):
             self.initial['data_ordem'] = SessaoPlenaria.objects.get(
                 pk=self.kwargs['pk']).data_inicio.strftime('%d/%m/%Y')
+            max_numero_ordem = ExpedienteMateria.objects.filter(
+              sessao_plenaria=self.kwargs['pk']).aggregate(Max('numero_ordem'))['numero_ordem__max']
+            self.initial['numero_ordem'] = (max_numero_ordem if max_numero_ordem else 0) + 1
             return self.initial
 
         def get_success_url(self):