假设您有一个User模型，并且希望为特定用户创建注解。
型号：

after_update :add_comment

 def add_comment 
  ActiveAdmin::Comment.create(
    resource_id: User.last.id, # id of that particular user to which you add comment
    namespace: 'admin',
    body: 'Your comment body',
    resource_type: 'User',
    author_id: 1, # id of the comment's author, could be AdminUser.first, for example
    author_type: 'AdminUser'
  )
end