rails - find_each, find_by_batch

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find_each

用法很简单,就是跟  Model.where.each do ... 一样的。

find_by_batch:

循环的时候,里面是  一个model array.

Block.where('id < 30').find_in_batches(batch_size: 10) do |g| g.each {|b| puts b.id} end;

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