How to make Devise lockable with number of failed attempts

Question

Using Devise 2.1.2 and Rails 3.2.6

I\'m doing this Q&A just in case others run into this problem because I found little and scattered documentation for it.

Answer 1

Simply uncomment this strings in devise migration:

  ## Lockable
  # t.integer  :failed_attempts, :default => 0 # Only if lock strategy is :failed_attempts
  # t.string   :unlock_token # Only if unlock strategy is :email or :both
  # t.datetime :locked_at