我可以使用回形針上傳圖片（保存副本）嗎？

Question

我想知道如果我有照片的網址，我可以使用回形針將它保存在我的網站上嗎？如果是這樣如何？

Answer 1

是的，這其實很簡單。有我的用戶模型使用頭像的代碼：

#a part of your model 
    has_attached_file :avatar, :styles => { :thumb => "50x50" }, :storage => :s3, 
         :path => "/:attachment/:id/:style/:filename", 
         :s3_credentials => Rails.root.join("config/s3.yml") 

    attr_accessor :avatar_url 

    before_validation :download_remote_file, :if => :avatar_url_provided? 

    def avatar_url_provided? 
    !self.avatar_url.blank? 
    end 

    def download_remote_file 
    self.avatar = do_download_remote_file 
    end 

    def do_download_remote_file 
    io = open(URI.parse(avatar_url)) 
      def 
       io.original_filename 
       base_uri.path.split('/').last 
      end 
    io.original_filename.blank? ? nil : io 
     rescue Exception => exc 
     logger.debug "ERROR WHEN DOWNLOADING REMOTE AVATAR FOR USER #{self.id} AND REMOTE URL #{self.avatar_url} - ERROR IS #{exc.message}" 
    end 

Answer 2

當然你可以做到