def find_each(options = {})
  find_in_batches(options) do |records|
    records.each { |record| yield record }
  end
end

为了完成你想要做的,你需要创建自己的修改版本的方法

class User
  def find_each(options = {})
    find_in_batches(options) do |records|
      records.each_with_index { |record| yield record,index }
    end
  end
end

User.find_each(:batch_size => 10000) do |user,index|
  ------
end

或使用实例变量.

index = 0
User.find_each(:batch_size => 10000) do |user|
  # ...
  index += 1
end

没有其他默认解决方案,如方法实现所示.