Include additional data from devise users

[jdunck]

current_sign_in_at and last_sign_in_at are available by default on devise models. We should extract that info (failing gracefully).

[jdunck]

Here's the default devise model:

create_table(:users) do |t|
  ## Database authenticatable
  t.string :email,              null: false, default: ""
  t.string :encrypted_password, null: false, default: ""

  ## Recoverable
  t.string   :reset_password_token
  t.datetime :reset_password_sent_at

  ## Rememberable
  t.datetime :remember_created_at

  ## Trackable
  t.integer  :sign_in_count, default: 0, null: false
  t.datetime :current_sign_in_at
  t.datetime :last_sign_in_at
  t.string   :current_sign_in_ip
  t.string   :last_sign_in_ip

  ## Confirmable
  # t.string   :confirmation_token
  # t.datetime :confirmed_at
  # t.datetime :confirmation_sent_at
  # t.string   :unconfirmed_email # Only if using reconfirmable

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


  t.timestamps null: false
end

[andrewberls]

This is of course a good idea, but I'm very unsure/curious how prevalent devise actually is in companies at any meaningful scale - I've never encountered it, but have also worked on < 10 production scale rails deployments