upload images to AWS::S3 in ruby using aws sdk gem

Using gem aws-sdk for a ROR application for uploading images to s3


Uploading images to a fixed bucket with different folders for each object or application.
The s3 keeps a limitation on the number of buckets creation whereas there is no
limitation for content inside a bucket.
This code will upload image for a user to s3 using aws-sdk gem. The bucket and the image uploaded are made public, so that the images uploaded are directly accessible. The input is takes is the image complete path 
where it is present, folder in which it should be uploaded and user_id for whom it should 
be uploaded.

  def save_screenshot_to_s3(image_location, folder_name,user_id)
      service = AWS::S3.new(:access_key_id => ACCESS_KEY_ID,
                          :secret_access_key => SECRET_ACCESS_KEY)
      bucket_name = "app-images"
      if(service.buckets.include?(bucket_name))
        bucket = service.buckets[bucket_name]
      else
        bucket = service.buckets.create(bucket_name)
      end
      bucket.acl = :public_read
      key = folder_name.to_s + "/" + File.basename(image_location)
      s3_file = service.buckets[bucket_name].objects[key].write(:file => image_location)
      s3_file.acl = :public_read
      user = User.where(id: user_id).first
      user.image = s3_file.public_url.to_s
      user.save
  end