错误信息error_messages_for was removed from Rails and is now available as a plugin)
在页面中使用<%= error_messages_for 'order' %>时，刷页面报错： error_messages_for was removed from Rails and is now available as a plugin. Please install it with `rails plugin install git://github.com/rails/dynamic_form.git

解决方法是：

在script文件夹下命令行：rails plugin install git://github.com/rails/dynamic_form.git

然后在Gemfile中添加 ：gem 'dynamic_form'

最后命令行：bundle install