User.all.each { |n| n.update_attribute(:email, true) }
参考
[In Rails Console. how to update a field for all records?](https://stackoverflow.com/questions/7693127/in-rails-console-how-to-update-a-field-for-all-records)
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User.all.each { |n| n.update_attribute(:email, true) }
[In Rails Console. how to update a field for all records?](https://stackoverflow.com/questions/7693127/in-rails-console-how-to-update-a-field-for-all-records)