How to implement account activation via e-mail link in Devise?

Question

Ruby on Rails

Actually the essence is clearly stated in the question. How to implement it?
If there is in the documentation, then poke your nose, please ...

Answer 1

https://github.com/plataformatec/devise/wiki/How-T...

Answer 2

stackoverflow.com/questions/8186584/how-do-i-set-u...