Fix the build.

lib/filter_best_posts.rb

@@ -59,7 +59,7 @@ class FilterBestPosts
   end
 
   def sort_posts
-    @posts.to_a.sort! { |a, b| a.post_number <=> b.post_number }
+    @posts = Post.from(@posts, :posts).order(post_number: :asc)
   end
 
 end

lib/topic_view.rb

@@ -66,7 +66,7 @@ class TopicView
 
     filter_posts(options)
 
-    if @posts
+    if @posts.present?
       if (added_fields = User.whitelisted_user_custom_fields(@guardian)).present?
         @user_custom_fields = User.custom_fields_for_ids(@posts.pluck(:user_id), added_fields)
       end
@@ -331,14 +331,6 @@ class TopicView
     @filtered_posts.by_newest.with_user.first(25)
   end
 
-  def current_post_ids
-    @current_post_ids ||= if @posts.is_a?(Array)
-      @posts.map { |p| p.id }
-    else
-      @posts.pluck(:post_number)
-    end
-  end
-
   # Returns an array of [id, post_number, days_ago] tuples.
   # `days_ago` is there for the timeline calculations.
   def filtered_post_stream
@@ -361,7 +353,7 @@ class TopicView
 
       post_numbers = PostTiming
         .where(topic_id: @topic.id, user_id: @user.id)
-        .where(post_number: current_post_ids)
+        .where(post_number: @posts.pluck(:post_number))
         .pluck(:post_number)
 
       post_numbers.each { |pn| result << pn }