在检查插件的rails3分支后,Paperclip会产生此错误.我的Gemfile有以下行:
gem 'paperclip', :git => 'http://github.com/thoughtbot/paperclip.git', :branch => 'rails3'
并且错误消息是:
NoMethodError: undefined method `has_attached_file' for #<Class:0x2a50530>