修复：操作日志兼容旧数据负责人指派

app/models/journal.rb

@@ -121,6 +121,10 @@ class Journal < ApplicationRecord
         old_value = detail.old_value 
         new_value = detail.value 
         content += "结束日期"
+      when 'assigned_to_id'
+        old_value = User.find_by_id(detail.old_value)&.nickname
+        new_value = User.find_by_id(detail.value)&.nickname
+        content += "负责人"
       end
       if old_value.nil? || old_value.blank? 
         content += "设置为<b>#{new_value}</b>"