使用carrierwave上传多列版本

Question

我开发使用rails4并使用carrierwave上传图像文件。

我将列添加到myModel以上传另一个图像列

class MyModel  < ActiveRecord::Base

    mount_uploader :image, ImageUploader
    ANDROID = {:image => [800, 355]}
    IPHONE = {:image => [800, 355]}
    THUMBNAIL = {:image => [150, 150]}

    mount_uploader :square_image, ImageUploader
    ANDROID = {:square_image => [800, 800]}
    IPHONE = {:square_image => [800, 800]}
    THUMBNAIL = {:square_image => [150, 150]}
end

修改文件后

我的rails项目发出警告信息

 warning: already initialized constant MyModel::ANDROID
 DEBUG[c0668d68]    app/models/my_model.rb:LINE_NUMBER: warning: previous definition of ANDROID was here

我不知道我在做什么..

帮帮我〜。