add support for page hierarchy

combo/data/models.py

@@ -34,6 +34,10 @@ class Page(models.Model):
     title = models.CharField(_('Title'), max_length=50)
     slug = models.SlugField()
     template_name = models.CharField(max_length=50)
+    parent = models.ForeignKey('self', null=True, blank=True)
+
+    def __unicode__(self):
+        return self.title
 
 
 class CellBase(models.Model):

combo/public/views.py

@@ -15,6 +15,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 from django.conf import settings
+from django.http import Http404
 from django.shortcuts import get_object_or_404, render
 
 from combo.data.models import CellBase, Page
@@ -23,7 +24,12 @@ def page(request):
     parts = [x for x in request.path_info.strip('/').split('/') if x]
     if not parts:
         parts = ['index']
-    page = get_object_or_404(Page, slug=parts[0])
+    pages = [get_object_or_404(Page, slug=x) for x in parts]
+    for i, page in enumerate(pages[1:]):
+        if page.parent_id != pages[i].id:
+            raise Http404()
+
+    page = pages[-1]
     ctx = {
         'page': page,
         'page_cells': CellBase.objects.filter(page_id=page.id