请教大家：我是在本地用 rails 搭建网站，现在想在本地能把图片上传到又拍云，网站一些代码如下。但是上传图片后，跳转到show.html.erb，图片的地址是：http://sssss-imgs.test.upcdn.net/img/img_name/00502fb437cb5ed9032f9393600578d8.png!320,图片打不开，好像图片没有上传到又拍云的服务器。请问我这是哪里出现了错误？请大家指导，非常感谢！！

1. 部分 Gemfile :

gem 'carrierwave', '~> 1.2', '>= 1.2.2'
gem 'carrierwave-upyun', '~> 0.2.2'
gem 'mini_magick'

2. config/initializers/carrierwave.rb : (这个是手动新增加的）

require "carrierwave"
require "carrierwave/validations/active_model"
CarrierWave.configure do |config|
  config.storage = :upyun
  config.remove_previously_stored_files_after_update = false
  config.upyun_username = "sssss"
  config.upyun_password = "ssssss123"
  config.upyun_bucket = "sssss-imgs"
  config.upyun_bucket_domain = "http://sssss-imgs.test.upcdn.net"
  config.upyun_api_host = "http://v0.api.upyun.com"
end

3. 基本上传组件 BaseUploader :

IMAGE_UPLOADER_ALLOW_IMAGE_VERSION_NAMES = %(320 640 800)
class BaseUploader < CarrierWave::Uploader::Base
  storage :upyun
  def store_dir
    "#{model.class.to_s.underscore}/#{mounted_as}"
  end

  def extension_white_list
    %w[jpg jpeg gif png svg]
  end


  def url(version_name = "")
    @url ||= super({})
    version_name = version_name.to_s
    return @url if version_name.blank?
    if not version_name.in?(IMAGE_UPLOADER_ALLOW_IMAGE_VERSION_NAMES)
      # To protected version name using, when it not defined, this will be give an error message in development environment
      raise "ImageUploader version_name:#{version_name} not allow."
    end
    [@url,version_name].join("!") 
  end

end

4. 图片上传组件 ImgUploader :

class ImageUploader < BaseUploader

  def filename
    if original_filename
      @name||=Digest::MD5.hexdigest(File.dirname(current_path))
      "#{@name}.#{file.extension}"
    end
  end
end

5. models img.rb :

class Img < ActiveRecord::Base
  mount_uploader :img_name, ImageUploader
end

6. imgs_controller.rb :

class ImgsController < ApplicationController

  def index
    @imgs = Img.all
  end

  def show
    @img = Img.find(params[:id])
  end

  def new
    @img = Img.new
  end

  def create
    @img = Img.new(img_params)
    @img.save
    redirect_to @img
  end

  def destroy
    @img.destroy
    render :index
  end

  private

  def img_params
    params.require(:img).permit!
  end
end

7. 上传图片和图片展示 :

## new.html.erb
<%= form_for @img do |f| %>
  <%= f.file_field :img_name %>
  <%= f.submit "上传" %>
<% end %>

## show.html.erb

<%= image_tag(@img.img_name.url("320")) %>

8. img 的 migration：

class CreateImgs < ActiveRecord::Migration[5.2]
  def change
    create_table :imgs do |t|
      t.string :img_name
      t.timestamps null: false
    end
  end
end