git 地址

• https://github.com/jnicklas/carrierwave

user 里增加

mount_uploader :avatar, AvatarUploader

然后 rails c 进行测试

u = User.new
u.avatar = File.open('somewhere')  #u.avatar = params[:file]
u.save!
u.avatar.url # => '/url/to/file.png'
u.avatar.current_path # => 'path/to/file.png'
u.avatar.identifier # => 'file.png'

还有很多高级选项