FIX: Removed some leftover posts references outside of the stream

app/assets/javascripts/discourse/controllers/topic_controller.js

@@ -90,7 +90,7 @@ Discourse.TopicController = Discourse.ObjectController.extend(Discourse.Selected
   },
 
   selectAll: function() {
-    var posts = this.get('posts');
+    var posts = this.get('postStream.posts');
     var selectedPosts = this.get('selectedPosts');
     if (posts) {
       selectedPosts.addObjects(posts);

app/assets/javascripts/discourse/models/topic.js

@@ -79,26 +79,6 @@ Discourse.Topic = Discourse.Model.extend({
     return this.urlForPostNumber(this.get('highest_post_number'));
   }.property('url', 'highest_post_number'),
 
-  // The last post in the topic
-  lastPost: function() {
-    var posts = this.get('posts');
-    return posts[posts.length-1];
-  },
-
-  postsChanged: function() {
-    var last, posts;
-    posts = this.get('posts');
-    last = posts[posts.length - 1];
-    if (!(last && last.set && !last.lastPost)) return;
-    _.each(posts,function(p) {
-      if (p.lastPost) {
-        p.set('lastPost', false);
-      }
-    });
-    last.set('lastPost', true);
-    return true;
-  }.observes('posts.@each', 'posts'),
-
   // The amount of new posts to display. It might be different than what the server
   // tells us if we are still asynchronously flushing our "recently read" data.
   // So take what the browser has seen into consideration.

app/assets/javascripts/discourse/views/post_view.js

@@ -9,8 +9,7 @@
 Discourse.PostView = Discourse.View.extend({
   classNames: ['topic-post', 'clearfix'],
   templateName: 'post',
-  classNameBindings: ['post.lastPost',
+  classNameBindings: ['postTypeClass',
-                      'postTypeClass',
                       'selected',
                       'post.hidden:hidden',
                       'post.deleted_at:deleted',