fix

app/controllers/messages_controller.rb

@@ -22,13 +22,13 @@ class MessagesController < ApplicationController
 
     messages = @board.messages.root_nodes.by_keywords(params[:search])
 
-    messages = messages.order('(sticky = 1) DESC') # 置顶
+    messages = messages.reorder('(sticky = 1) DESC') # 置顶
 
     messages =
       case sort_type
-      when 'time' then messages.reorder("created_on #{sort}")
-      when 'hot' then messages.reorder("descendants_count #{sort}")
-      else messages.reorder("created_on #{sort}")
+      when 'time' then messages.order("created_on #{sort}")
+      when 'hot' then messages.order("descendants_count #{sort}")
+      else messages.order("created_on #{sort}")
       end
 
     messages = messages.includes(:author)