Merge diffs from master

lib/post_creator.rb

@@ -443,6 +443,7 @@ class PostCreator
       attrs[:word_count] = (@topic.word_count || 0) + @post.word_count
       attrs[:excerpt] = @post.excerpt_for_topic if new_topic?
       attrs[:bumped_at] = @post.created_at unless @post.no_bump
+      @topic.update_columns(attrs)
     end
 
     @topic.update_columns(attrs)