使用carrierwave将图像上传到谷歌 Cloud 存储，文件名最终被保存，而不是桶中图像的公共链接

我正在尝试使用carrierwave gem从我的rails 4.2应用程序实现图像上传到谷歌 Cloud 存储 . 每当我上传图像时，它都会很好地上传到存储桶，但它作为原始图像名称保存在数据库中，例如 image.png ，而不是图像的Google Cloud 存储公共链接，例如 https://storage.googleapis.com/project/bucket/image.png

不太清楚从这里需要做什么才能从桶中保存公共链接而不仅仅是文件名 .

carrierwave.rb文件

CarrierWave.configure do |config|
  config.fog_credentials = {
    provider:                         'Google',
    google_storage_access_key_id:     'key',
    google_storage_secret_access_key: 'secret key'
  }
  config.fog_directory = 'bucket-name'
end

上传/ check_item_value_image_uploader.rb

class CheckItemValueImageUploader < CarrierWave::Uploader::Base

  # Include RMagick or MiniMagick support:
  # include CarrierWave::RMagick
  # include CarrierWave::MiniMagick

  # Choose what kind of storage to use for this uploader:
  #storage :file
   storage :fog

  # Override the directory where uploaded files will be stored.
  # This is a sensible default for uploaders that are meant to be mounted:
  def store_dir
    "check-item-value-images/#{model.id}"
  end

  # Add a white list of extensions which are allowed to be uploaded.
  # For images you might use something like this:
   def extension_white_list
     %w(jpg jpeg gif png)
   end

end

相关的宝石

gem 'gcloud'
gem "fog"
gem 'google-api-client', '~> 0.8.6'
gem "mime-types"

check_category_item_value模型

mount_uploader :value, CheckItemValueImageUploader

check_category_item_value更新方法

if @check_category_item_value.save 
   flash[:success] = "Successfully updated"
   redirect_to category_items_edit_path(@guide, @category, @category_item)
else
   render 'category_items/edit'
end

编辑表格

<%= form_for(@check_category_item_value) do |f| %>
   <%= f.file_field :value, :value => item_key.value, accept: "image/jpeg, image/jpg, image/gif, image/png" %>
   <%= f.submit "Submit" %><hr>
 <% end %>

表单工作正常但保存的值是原始图像名称而不是图像的Google Cloud 存储公共链接 .

我使用谷歌 Cloud 平台的carrierwave docs，this post和this video来获得我现在拥有的东西 . 我错过了什么？

update

添加 config.fog_public = true 什么都不做

CarrierWave.configure do |config|
  config.fog_credentials = {
    provider:                         'Google',
    google_storage_access_key_id:     'key',
    google_storage_secret_access_key: 'secret key'
  }
  config.fog_public = true
  config.fog_directory = 'bucket-name'
end