Added Next, Previous Article & Home navigation

3 files changed, 33 insertions, 8 deletions

diff --git a/app/helpers/blog_posts_helper.rb b/app/helpers/blog_posts_helper.rb
index fb90e94..a74ec33 100644
--- a/app/helpers/blog_posts_helper.rb
+++ b/app/helpers/blog_posts_helper.rb
@@ -19,4 +19,8 @@ module BlogPostsHelper
     html += '</nav></section>'
     html.html_safe
   end
+  
+  def next_or_previous?(post)
+    post.next.present? or post.prev.present?
+  end
 end
diff --git a/app/models/blog_post.rb b/app/models/blog_post.rb
index 562a9b9..471be72 100644
--- a/app/models/blog_post.rb
+++ b/app/models/blog_post.rb
@@ -9,27 +9,41 @@ class BlogPost < ActiveRecord::Base
   validates_uniqueness_of :title
 
   has_friendly_id :title, :use_slug => true
-
-  default_scope :order => "published_at DESC"
   
   if Rails.version < '3.0.0'
-    named_scope :by_archive, lambda { |archive_date| {:conditions => ['published_at between ? and ?', archive_date.beginning_of_month, archive_date.end_of_month]} }
+    named_scope :by_archive, lambda { |archive_date| {:conditions => ['published_at between ? and ?', archive_date.beginning_of_month, archive_date.end_of_month], :order => "published_at DESC"} }
   else
     scope :by_archive, lambda { |archive_date|
-      where ['published_at between ? and ?', archive_date.beginning_of_month, archive_date.end_of_month]
+      where(['published_at between ? and ?', archive_date.beginning_of_month, archive_date.end_of_month]).order("published_at DESC")
     }
   end
   
   if Rails.version < '3.0.0'
-    named_scope :all_previous, :conditions => ['published_at <= ?', Time.now.beginning_of_month]
+    named_scope :all_previous, :conditions => ['published_at <= ?', Time.now.beginning_of_month], :order => "published_at DESC"
   else
-    scope :all_previous, where(['published_at <= ?', Time.now.beginning_of_month])
+    scope :all_previous, where(['published_at <= ?', Time.now.beginning_of_month]).order("published_at DESC")
   end
 
   if Rails.version < '3.0.0'
-    named_scope :live, lambda { {:conditions => ["published_at < ? and draft = ?", Time.now, false]} }
+    named_scope :live, lambda { {:conditions => ["published_at < ? and draft = ?", Time.now, false], :order => "published_at DESC"} }
+  else
+    scope :live, lambda { where( "published_at < ? and draft = ?", Time.now, false).order("published_at DESC") }
+  end
+  
+  if Rails.version < '3.0.0'
+    named_scope :previous, lambda { |i| { :conditions => ["published_at < ?", i.published_at], :order => "published_at DESC", :limit => 1 } }
+    named_scope :next, lambda { |i| { :condtions => ["published_at > ?", i.published_at], :order => "published_at ASC", :limit => 1 } }
   else
-    scope :live, lambda { where( "published_at < ? and draft = ?", Time.now, false) }
+    scope :previous, lambda { |i| where(["published_at < ?", i.published_at]).order("published_at DESC").limit(1) }
+    scope :next, lambda { |i| where(["published_at > ?", i.published_at]).order("published_at ASC").limit(1) }
+  end
+  
+  def next
+    self.class.next(self).first
+  end
+
+  def prev
+    self.class.previous(self).first
   end
   
   def live?
diff --git a/app/views/blog/posts/show.html.erb b/app/views/blog/posts/show.html.erb
index f8d4b35..6d11197 100644
--- a/app/views/blog/posts/show.html.erb
+++ b/app/views/blog/posts/show.html.erb
@@ -31,6 +31,13 @@
       <span class="st_sharethis" displayText="ShareThis"></span>
     <% end %>
   </article>
+  <% if next_or_previous?(@blog_post) -%>
+    <nav id="next_prev_article">
+      <%= link_to raw(truncate(@blog_post.next.title) + "&nbsp;&#187;"), @blog_post.next, :class => 'next' if @blog_post.next.present? %>
+      <%= link_to 'Blog Home', blog_root_path, :class => 'home' %>
+      <%= link_to "&#171;&nbsp;".html_safe + truncate(@blog_post.prev.title), @blog_post.prev, :class => 'prev' if @blog_post.prev.present? %>
+    </nav><!-- /next_prev_article -->
+  <% end -%>
   <% if BlogPost.comments_allowed? %>
     <aside id="comments">
       <h2><%= t('.comments.title') %></h2>