如何使用rails命令恢复rails控制台中已经删除的数据？

Question

I deleted some data in a database but I want those data back.

Is there any way to restore the data from a database that was deleted using the rails console?

Answer 1

不幸的是，除非先前删除的对象已保存到变量或其他地方，否则您无法使用控制台工具恢复数据。

Answer 2

No, you cannot recover any data that was deleted using the rails console. You will need a backup. If you don't have a backup, you will not be able to restore the data.

However, depending on how you removed your data, you might have had a chance to recover it at the moment you deleted it.

If you used ActiveRecord code like the following

Rails.application.eager_load!
ActiveRecord::Base.connection.disable_referential_integrity do
  ApplicationRecord.descendants.each do |model|
    model.delete_all
  end
end

The data is lost. (Have a look at this question and the answers about different ways to truncate data)

If you did something like this:

objects = MyModel.delete_all

then you might have had a chance to recover them right after that using the objects array.