From a5445a03e08a5e7b7177bdeefbe82fc20547a654 Mon Sep 17 00:00:00 2001
From: Gergely Polonkai <gergely@polonkai.eu>
Date: Thu, 19 Jun 2014 14:25:23 +0000
Subject: [PATCH] Add previous/next article links to blog articles

---
 blog/templates/blog/post.html |  6 ++++++
 blog/views.py                 | 15 ++++++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/blog/templates/blog/post.html b/blog/templates/blog/post.html
index 5e3b4a0..087b195 100644
--- a/blog/templates/blog/post.html
+++ b/blog/templates/blog/post.html
@@ -29,4 +29,10 @@
 </script>
 <noscript>Please enable JavaScript to view the <a href="http://disqus.com/?ref_noscript">comments powered by Disqus.</a></noscript>
 <a href="http://disqus.com" class="dsq-brlink">comments powered by <span class="logo-disqus">Disqus</span></a>
+{% if prev_post %}
+Previous: <a href="{% url 'blog:read' prev_post.created_at.year prev_post.created_at.month prev_post.created_at.day prev_post.slug %}">{{ prev_post.title }}</a>
+{% endif %}
+{% if next_post %}
+Next: <a href="{% url 'blog:read' next_post.created_at.year next_post.created_at.month next_post.created_at.day next_post.slug %}">{{ next_post.title }}</a>
+{% endif %}
 {% endif %}
diff --git a/blog/views.py b/blog/views.py
index 8b755a2..23c8e35 100644
--- a/blog/views.py
+++ b/blog/views.py
@@ -58,7 +58,20 @@ def datepage(request, year, month, day, page):
 
 def read(request, year, month, day, slug):
     post = get_object_or_404(Post, created_at__year=int(year), created_at__month=int(month), created_at__day=int(day), slug=slug, draft=False)
-    return render(request, 'blog/view.html', {'post': post})
+    next_post = Post.objects.filter(created_at__gt = post.created_at).order_by('created_at')[0:1]
+    prev_post = Post.objects.filter(created_at__lt = post.created_at).order_by('-created_at')[0:1]
+
+    if not next_post:
+        next_post = None
+    else:
+        next_post = next_post[0]
+
+    if not prev_post:
+        prev_post = None
+    else:
+        prev_post = prev_post[0]
+
+    return render(request, 'blog/view.html', {'post': post, 'prev_post': prev_post, 'next_post': next_post})
 
 def codechunk(request, language, slug):
     chunk = get_object_or_404(CodeChunk, language=language, slug=slug)