Rails - Jul 2014 - Signature/Expires/Access Key ID appearing in URL Params aws paperclip

s3 url that expires after 1 hr
here is code

file_name_in_s3 = "topic_alerts/"+report_name
s3_config = YAML.load_file("#{Rails.root}/config/s3.yml")
s3 = AWS::S3.new(:access_key_id =>
s3_config['development']['access_key_id'],:secret_access_key
=>
s3_config['development']['secret_access_key'])
bucket = s3.buckets[s3_config['development']['bucket']]
object = bucket.objects[file_name_in_s3]
s3_obj_url = object.url_for(:read,:authenticated =>
false,:response_content_disposition => "attachment")




url generated is signed url and expires in one hr.. plshelp me to find a
solutin to genrate public url with out parm values signature and expires

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