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AWS::S3::S3Object.url_for - How to do this with the new AWS SDK Gem?

def authenticated_url(style = nil, expires_in = 90.minutes)

      AWS::S3::S3Object.url_for(attachment.path(style || attachment.default_style), attachment.bucket_name, :expires_in => expires_in, :use_ssl => true)

  end

       

undefined method `url_for' for AWS::S3:Class

       

def authenticated_url(style = nil, expires_in = 90.minutes)

  attachment.s3_object(style).url_for(:read, :secure => true, :expires => expires_in).to_s

end

       

bucket = AWS::S3::Bucket.new(attachment.bucket_name)

s3object = AWS::S3::S3Object.new(bucket, attachment.path(style || attachment.default_style))

s3object.url_for(:read, :expires => expires_in)

       

def authenticated_url(style = nil, expires_in = 90.minutes)

   self.attachment.expiring_url(expires_in, (style || attachment.default_style))

 end