rrs: Fix frontpage redirect

We was experimenting fixed redirects due to urls are
cached at init of rrs.

Move the redirect Release, Milestone selection to a view
called FrontPageRedirect.

Signed-off-by: Aníbal Limón <anibal.limon@linux.intel.com>

rrs/urls.py

@@ -1,19 +1,11 @@
 from django.conf.urls import patterns, include, url
 
 from rrs.models import Release, Milestone
-from rrs.views import RecipeListView, recipes_report, RecipeDetailView, MaintainerListView
+from rrs.views import RecipeListView, recipes_report, RecipeDetailView, \
+    MaintainerListView, FrontPageRedirect
 
 urlpatterns = patterns('',
-    url(r'^$', redirect_to,
-        {'url' :
-            reverse_lazy('recipes',
-                args = (
-                    Release.get_current().name,
-                    Milestone.get_current(Release.get_current()).name,
-                )
-            ),
-         'permanent' : False
-        },
+    url(r'^$', FrontPageRedirect.as_view(),
         name='frontpage'),
     url(r'^recipes/(?P<release_name>.*)/(?P<milestone_name>.*)/$',
         RecipeListView.as_view(

rrs/views.py

@@ -6,14 +6,22 @@ from django.http import HttpResponse
 from datetime import date, datetime
 from django.http import Http404
 from django.shortcuts import get_object_or_404
-from django.views.generic import ListView, DetailView
-from django.core.urlresolvers import resolve
+from django.views.generic import ListView, DetailView, RedirectView
+from django.core.urlresolvers import resolve, reverse
 
 from layerindex.models import Recipe
 from rrs.models import Release, Milestone, Maintainer, RecipeMaintainerHistory, \
         RecipeMaintainer, RecipeUpstreamHistory, RecipeUpstream, \
         RecipeDistro, RecipeUpgrade, Raw
 
+class FrontPageRedirect(RedirectView):
+    permanent = False
+
+    def get_redirect_url(self):
+        release_name = Release.get_current().name
+        milestone_name = Milestone.get_current(Release.get_current()).name
+        return reverse('recipes', args=(release_name, milestone_name))
+
 def _check_url_params(upstream_status, maintainer_name):
     get_object_or_404(Maintainer, name=maintainer_name)