module Devise::Schema

def apply_schema(name, type, options={})

Overwrite with specific modification to create your own schema. 
def apply_schema(name, type, options={})
  raise NotImplementedError
end

def authenticatable(*args) 

def authenticatable(*args)
  ActiveSupport::Deprecation.warn "t.authenticatable in migrations is deprecated. Please use t.database_authenticatable instead.", caller
  database_authenticatable(*args)
end

def confirmable

Creates confirmation_token, confirmed_at and confirmation_sent_at. 
def confirmable
  apply_schema :confirmation_token,   String
  apply_schema :confirmed_at,         DateTime
  apply_schema :confirmation_sent_at, DateTime
end

def database_authenticatable(options={})

* :null - When true, allow columns to be null.
== Options

Creates email, encrypted_password and password_salt. 
def database_authenticatable(options={})
  null    = options[:null] || false
  default = options[:default] || ""
  if options.delete(:encryptor)
    ActiveSupport::Deprecation.warn ":encryptor as option is deprecated, simply remove it."
  end
  apply_schema :email,              String, :null => null, :default => default
  apply_schema :encrypted_password, String, :null => null, :default => default, :limit => 128
  apply_schema :password_salt,      String, :null => null, :default => default
end

def lockable

Creates failed_attempts, unlock_token and locked_at 
def lockable
  apply_schema :failed_attempts, Integer, :default => 0
  apply_schema :unlock_token,    String
  apply_schema :locked_at,       DateTime
end

def recoverable

Creates reset_password_token. 
def recoverable
  apply_schema :reset_password_token, String
end

def rememberable

Creates remember_token and remember_created_at. 
def rememberable
  apply_schema :remember_token,      String
  apply_schema :remember_created_at, DateTime
end

def token_authenticatable

Creates authentication_token. 
def token_authenticatable
  apply_schema :authentication_token, String
end

def trackable

current_sign_in_ip, last_sign_in_ip.
Creates sign_in_count, current_sign_in_at, last_sign_in_at, 
def trackable
  apply_schema :sign_in_count,      Integer, :default => 0
  apply_schema :current_sign_in_at, DateTime
  apply_schema :last_sign_in_at,    DateTime
  apply_schema :current_sign_in_ip, String
  apply_schema :last_sign_in_ip,    String
end