Question

我想知道我是否有照片的网址，我可以使用回形针在我的网站上保存它的副本吗？如果是这样的话？

Answer 1

是的，实际上非常简单。我的用户模型中的代码使用了头像：

  #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

当然你可以做到

我可以使用回形针从网上传输图像（保存副本）吗？

2 个答案: