I have a fully functional authentication system with a user table that has over fifty columns. It's simple but it does hash encryption with salt, uses email instead of usernames, and has two separate kinds of users with an admin as well.

I'm looking to incorporate Devise authentication into my application to beef up the extra parts like email validation, forgetting passwords, remember me tokens, etc... I just wanted to see if anyone has any advice or problems they've encountered when incorporating Devise into an already existing user structure. The essential fields in my user model are:

  t.string    :first_name, :null => false
  t.string    :last_name, :null => false
  t.string    :email, :null => false
  t.string    :hashed_password
  t.string    :salt
  t.boolean   :is_userA, :default => false
  t.boolean   :is_userB, :default => false
  t.boolean   :is_admin, :default => false
  t.boolean :active, :default => true
  t.timestamps

For reference sake, here's the Devise fields from the migration:

  t.database_authenticatable :null => false
  t.confirmable
  t.recoverable
  t.rememberable
  t.trackable

That eventually turn into these actual fields in the schema:

t.string   "email",                               :default => "", :null => false
t.string   "encrypted_password",   :limit => 128, :default => "", :null => false
t.string   "password_salt",                       :default => "", :null => false
t.string   "confirmation_token"
t.datetime "confirmed_at"
t.datetime "confirmation_sent_at"
t.string   "reset_password_token"
t.string   "remember_token"
t.datetime "remember_created_at"
t.integer  "sign_in_count",                       :default => 0
t.datetime "current_sign_in_at"
t.datetime "last_sign_in_at"
t.string   "current_sign_in_ip"
t.string   "last_sign_in_ip"
t.datetime "created_at"
t.datetime "updated_at"

What do you guys recommend? Do I just remove email, hashed_password, and salt from my migration and put in the 5 Devise migration fields and everything will be OK or do I need to do something else?