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Q: 

How to auto-generate passwords in Rails Devise?

I am trying out how Devise works with one of my projects for user authentication. There is a user requirement that their admin should be able to generate a batch of username and user's password from time to time, and then the admin will email the new username and password to his users.

Assume the admin has the knowledge of direct SQL on the MySQL database, how can the generated usernames/passwords recognized by Devise? Thanks!

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