[snowy] Use a pre-save signal handler to set is_notebook

[Brad Taylor <btaylor src gnome org>]

commit 2b25a12bb2e57e6b2fe3ac672b8f100848c7ca8d
Author: Brad Taylor <brad getcoded net>
Date:   Tue May 19 13:51:57 2009 -0400

    Use a pre-save signal handler to set is_notebook
---
 api/handlers.py |    8 ++------
 notes/models.py |   13 +++++++++++--
 2 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/api/handlers.py b/api/handlers.py
index aacdde3..38c12c7 100644
--- a/api/handlers.py
+++ b/api/handlers.py
@@ -137,16 +137,12 @@ class NotesHandler(BaseHandler):
             if c.has_key('open-on-startup'): note.open_on_startup = (c['open-on-startup'] == True)
             if c.has_key('tags'):
                 note.tags.clear()
-                for tagName in c['tags']:
-                    is_notebook = tagName.startswith('system:notebook:')
+                for tag_name in c['tags']:
                     tag, created = NoteTag.objects.get_or_create(author=user,
-                                                                 name=tagName,
-                                                                 is_notebook=is_notebook)
+                                                                 name=tag_name)
                     note.tags.add(tag)
 
             note.last_sync_rev = new_sync_rev
-
-            # TODO: tags
             note.save()
 
         profile = user.get_profile()
diff --git a/notes/models.py b/notes/models.py
index 44d747a..2276b60 100644
--- a/notes/models.py
+++ b/notes/models.py
@@ -15,9 +15,9 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 
-from django.db import models
+from django.db.models.signals import post_save, pre_save
 from django.contrib.auth.models import User
-from django.db.models.signals import post_save
+from django.db import models
 
 from autoslug.fields import AutoSlugField
 
@@ -86,6 +86,15 @@ class NoteTag(models.Model):
             return self.name.split(':', 2)[-1]
         return self.name
 
+def _update_is_notebook(sender, instance, **kwargs):
+    """
+    Update is_notebook based upon the NoteTag name.
+    """
+    instance.is_notebook = instance.name.startswith('system:notebook:')
+
+pre_save.connect(_update_is_notebook, sender=NoteTag,
+                 dispatch_uid='snowy.notes.models.NoteTag')
+
 
 class UserProfile(models.Model):
     user = models.ForeignKey(User, unique=True)