more fixes for order of threadreplies

app/controllers/forums_controller.rb

@@ -11,7 +11,7 @@ class ForumsController < ApplicationController
     @threads = @forum.forumthreads.select {|f| f.can_read?(current_user) }.to_a
     @threads.sort_by! do |t|
       # sticky goes first, then sort by last activity (new replies)
-      [t.sticky ? 0 : 1, -(t.replies.last.try(:created_at) || t.created_at).to_i]
+      [t.sticky ? 0 : 1, -(t.replies.order(:id).last.try(:created_at) || t.created_at).to_i]
     end
     @threads = Kaminari.paginate_array(@threads).page(params[:page])
   end

app/controllers/threadreplies_controller.rb

@@ -37,7 +37,7 @@ class ThreadrepliesController < ApplicationController
       if @reply.update_attributes(reply_params)
         @reply.send_new_reply_mail(old_content)
         flash[:notice] = "Reply updated!"
-        position = @reply.thread.replies.index(@reply)
+        position = @reply.thread.replies.order(:id).index(@reply)
         page     = position / Kaminari.config.default_per_page + 1
         redirect_to forumthread_path(@reply.thread, page: page) + "#reply-#{@reply.id}"
       else