rails3 paperclip一些報錯到處理方法

rails3 paperclip在上傳圖片後報錯：

Paperclip::CommandNotFoundError

is not recognized by the 'identify' command.

等是因爲指向目錄不對導致到

解決方法是
$ which identify
/some/path/to/identify

修改config/environments/development.rb
Paperclip.options[:command_path] = "/some/path/to"