user.rb

class User
  include Mongoid::Document
  # Include default devise modules. Others available are:
  # :token_authenticatable, :confirmable,
  # :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable, 
         :omniauthable, :confirmable

  ## Database authenticatable
  field :email,              type: String, default: ""
  field :encrypted_password, type: String, default: ""
  field :name,               type: String, default: ""

  validates_presence_of :email
  validates_presence_of :encrypted_password
  
  ## Recoverable
  field :reset_password_token,   type: String
  field :reset_password_sent_at, type: Time

  ## Rememberable
  field :remember_created_at, type: Time

  ## Trackable
  field :sign_in_count,      type: Integer, default: 0
  field :current_sign_in_at, type: Time
  field :last_sign_in_at,    type: Time
  field :current_sign_in_ip, type: String
  field :last_sign_in_ip,    type: String

  ## Confirmable
  field :confirmation_token,   type: String
  field :confirmed_at,         type: Time
  field :confirmation_sent_at, type: Time
  field :unconfirmed_email,    type: String # Only if using reconfirmable

  ## Lockable
  field :failed_attempts, type: Integer, default: 0 # Only if lock strategy is :failed_attempts
  field :unlock_token,    type: String # Only if unlock strategy is :email or :both
  field :locked_at,       type: Time

  ## Token authenticatable
  # field :authentication_token, type: String

  index({email: 1, name: 1}, {unique: true, background: true})
end