From 1b6cf5261c2a87c507fef290bf9d2af5606c8451 Mon Sep 17 00:00:00 2001
From: Dan McGee <dan@archlinux.org>
Date: Mon, 20 Sep 2010 16:21:08 -0500
Subject: Auto-populate slug on news item creation

And make sure it is unique through a few queries and some magic.

Signed-off-by: Dan McGee <dan@archlinux.org>
---
 news/views.py | 18 ++++++++++++++++--
 urls.py       |  2 +-
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/news/views.py b/news/views.py
index 7fa92c8a..f3d7312f 100644
--- a/news/views.py
+++ b/news/views.py
@@ -2,6 +2,7 @@ from django import forms
 from django.contrib.auth.decorators import permission_required
 from django.http import HttpResponse
 from django.shortcuts import get_object_or_404, redirect
+from django.template.defaultfilters import slugify
 from django.views.decorators.cache import never_cache
 from django.views.generic import list_detail, create_update
 from django.views.generic.simple import direct_to_template
@@ -21,7 +22,7 @@ def view(request, slug=None):
             template_object_name='news')
 
 #TODO: May as well use a date-based list here sometime
-def list(request):
+def news_list(request):
     return list_detail.object_list(request,
             News.objects.all().select_related('author').defer('content'),
             paginate_by=50,
@@ -31,7 +32,19 @@ def list(request):
 class NewsForm(forms.ModelForm):
     class Meta:
         model = News
-        exclude=('id', 'author', 'postdate')
+        exclude=('id', 'slug', 'author', 'postdate')
+
+def find_unique_slug(newsitem):
+    '''Attempt to find a unique slug for this news item.'''
+    existing = list(News.objects.values_list('slug', flat=True).distinct())
+
+    suffixed = slug = slugify(newsitem.title)
+    suffix = 0
+    while suffixed in existing:
+        suffix += 1
+        suffixed = "%s-%d" % (slug, suffix)
+
+    return suffixed
 
 @permission_required('news.add_news')
 @never_cache
@@ -41,6 +54,7 @@ def add(request):
         if form.is_valid():
             newsitem = form.save(commit=False)
             newsitem.author = request.user
+            newsitem.slug = find_unique_slug(newsitem)
             newsitem.save()
             return redirect(newsitem.get_absolute_url())
     else:
diff --git a/urls.py b/urls.py
index 5ff57970..00d0986f 100644
--- a/urls.py
+++ b/urls.py
@@ -69,7 +69,7 @@ urlpatterns = patterns('',
     (r'^news/(?P<slug>[-\w]+)/$',        'news.views.view'),
     (r'^news/(?P<slug>[-\w]+)/edit/$',   'news.views.edit'),
     (r'^news/(?P<slug>[-\w]+)/delete/$', 'news.views.delete'),
-    (r'^news/$',                         'news.views.list', {}, 'news-list'),
+    (r'^news/$',                         'news.views.news_list', {}, 'news-list'),
 
     (r'^mirrors/$',        'devel.views.mirrorlist', {}, 'mirrors-list'),
 
-- 
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