prunable b

s3_prunable_after.rb

# app/util/prunable.rb
class Prunable
  def self.from_assets(assets)
    assets.select &method(:is_prunable?)
  end

  def self.is_prunable?(asset)
    asset.created_at < Date.today - 30
  end
end

# app/jobs/s3_pruner.rb
class S3FilePruner < JobProcessor
  def process_job
    Prunable.from_assets(Image.all).each do |image|
      S3Object.delete image.s3_object_name, image.s3_bucket_name
      image.destroy
    end
  end
end