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@@ -10,5 +10,5 @@ nbproject/project.*
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 test
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 coverage
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 coverage/*
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-
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+config/*.sphinx.conf
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@@ -17,6 +17,7 @@ class PostsController < ApplicationController
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     @posts = @topic.posts.find(:all, :order => "id DESC", :limit => 10)
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     @post = @topic.posts.build(params[:post].merge!(:user => current_user))
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     if @post.save
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+      @topic.update_attribute("last_post_id", @post.id)
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       page = (@topic.posts.size.to_f / 30).ceil
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       flash[:notice] = "Post has been created."
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       redirect_to forum_topic_path(@post.forum,@topic, :page => page)

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@@ -24,6 +24,7 @@ class TopicsController < ApplicationController
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     @post = @topic.posts.build(params[:post].merge(:user_id => current_user.id))
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     @topic.sticky = true if params[:topic][:sticky] == 1 && current_user.admin?
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     if @topic.save
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+      @topic.update_attribute("last_post_id", @post.id)
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       flash[:notice] = "Topic has been created."
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       redirect_to forum_topic_path(@topic.forum, @topic)
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     else

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@@ -17,17 +17,23 @@ class Forum < ActiveRecord::Base
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   #There's no easy way to do it
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   alias_method :old_topics, :topics
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-  #NOT TESTED
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-  #POTENTIALLY UNSTABLE
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-  def update_last_post
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-    if posts.first.nil?
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-      self.last_post = nil
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-      self.last_post_forum = nil
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-    else
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-      self.last_post = posts.first
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-      self.last_post_forum = posts.first.forum if posts.first.forum != self
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+  def update_last_post(new_forum, post=nil)
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+    post ||= posts.last
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+    self.last_post = post
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+    self.last_post_forum = nil
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+    self.save!
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+    for ancestor in (ancestors - [new_forum])
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+      if !post.nil?
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+        if ancestor.last_post.nil? || (ancestor.last_post.created_at < post.created_at)
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+          ancestor.last_post = post
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+          ancestor.last_post_forum = self
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+        end
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+      else
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+        ancestor.last_post = nil
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+        ancestor.last_post_forum = nil
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+      end
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+      ancestor.save
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     end
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-    save
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   end
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   def topics

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@@ -3,6 +3,7 @@ class Topic < ActiveRecord::Base
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   belongs_to :forum
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   has_many :posts, :dependent => :destroy, :order => "created_at asc"
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   has_many :users, :through => :posts
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+  belongs_to :last_post, :class_name => "Post"
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   #makes error_messages_for return the wrong number of errors.
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   validates_associated :posts, :message => nil
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@@ -19,11 +20,13 @@ class Topic < ActiveRecord::Base
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   def move!(new_forum_id)
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     old_forum = Forum.find(forum_id)
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+    was_old_last_post = old_forum.last_post == self.last_post
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     new_forum = Forum.find(new_forum_id)
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     update_attribute("forum_id", new_forum_id)
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-    posts.last.update_forum if posts.last != new_forum.posts.last
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+    is_new_last_post = new_forum.last_post.nil? || (new_forum.last_post.created_at <= posts.last.created_at)
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+    new_forum.update_last_post(new_forum, posts.last) if is_new_last_post
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     old_forum.reload
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-    old_forum.update_last_post
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+    old_forum.update_last_post(new_forum) if was_old_last_post
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   end
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   def lock!

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@@ -45,7 +45,7 @@ describe ForumsController do
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   it "should show the admin forum to the administrator" do
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     login_as(:administrator)
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-    Forum.should_receive(:find).twice.and_return(@forum)
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+    Forum.should_receive(:find).twice.and_return(@forum, @forums)
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     @forum.should_receive(:viewable?).and_return(true)
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     @forum.should_receive(:topics).and_return(@topics)
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     @topics.should_receive(:paginate).and_return(@topics)

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@@ -68,6 +68,7 @@ describe PostsController, "as plebian" do
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     @post.should_receive(:save).and_return(true)
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     @post.should_receive(:forum).twice.and_return(@forum)
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     @post.should_receive(:topic).and_return(@topic)
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+    @topic.should_receive(:update_attribute).with("last_post_id", @post.id).and_return(true)
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     post 'create', {:post => { :text => "This is a new post" }, :topic_id => topics(:user).id }
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     flash[:notice].should eql("Post has been created.")
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     response.should redirect_to(forum_topic_path(@post.forum, @post.topic, :page => 1))

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@@ -105,6 +105,7 @@ describe TopicsController do
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       @posts.should_receive(:build).and_return(@post)
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       @topic.should_receive(:forum).and_return(@forum)
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       @topic.should_receive(:save).and_return(true)
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+      @topic.should_receive(:update_attribute).with("last_post_id", @post.id).and_return(true)
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       post 'create', { :topic => { :subject => "Subject"}, :post => { :text => "New text!"}, :forum_id => forums(:admins_only).id }
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       flash[:notice].should eql("Topic has been created.")
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       #TODO: Test for redirect