1

app/models/memo.rb

@@ -43,7 +43,9 @@ class Memo < ApplicationRecord
 
   # 主贴的名称
   def main_subject
-    parent.present? ? parent.subject : subject
+    memo = Memo.find_by(root_id: id)
+    Rails.logger.info("###############memo: #{memo&.subject}")
+    memo ? memo.subject : subject
   end
 
   private

app/models/message.rb

@@ -41,6 +41,7 @@ class Message < ApplicationRecord
 
   # 主贴的名称
   def main_subject
+    Rails.logger.info("##########parent: #{parent&.subject}")
     parent.present? ? parent.subject : subject
   end