If each title is unique and you need alphabetical, try this in your Post
model.
def previous_post
self.class.first(:conditions => ["title < ?", title], :order => "title desc")
end
def next_post
self.class.first(:conditions => ["title > ?", title], :order => "title asc")
end
You can then link to those in the view.
<%= link_to("Previous Post", @post.previous_post) if @post.previous_post %>
<%= link_to("Next Post", @post.next_post) if @post.next_post %>
Untested, but it should get you close. You can change title
to any unique attribute (created_at
, id
, etc.) if you need a different sort order.
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