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class ActiveRecord::Base def self.lazy_find(args = {}, &block) total = self.count(*args) count = 0 args[:limit] ||= 100 args[:offset] = count while items = self.find(:all, args) and not items.empty? items.each do |item| args[:offset] += 1 block.call item end puts "#{sprintf("%2.2f", 100 * count.to_f / total)}%: #{count}\n" end end end

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