Rails, Mongoid, and Devise nested Models

I am trying to Nest a class within Devise that will hold a user's skills and desired skills into an array but I can not seem to get my form objects to save into the array.

    Class User
  include Mongoid::Document
  devise :database_authenticatable, :registerable,
      :recoverable, :rememberable, :trackable, :validatable
 
  ## Database authenticatable
  field :email,              :type => String, :null => false, :default => ""
  field :encrypted_password, :type => String, :null => false, :default => ""
 
 
 
  ## 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
 
 
  field :first_name
  field :last_name
 
  field :location
 
 
  index([[:skills, :desired]], :background => true)
 
  validates_presence_of :first_name, :last_name,  :location
  validates_uniqueness_of :first_name, :last_name, :email, :case_sensitive => false
  attr_accessible :first_name, :last_name, :email, :password, :password_confirmation,     :remember_me,  :location
 
 embeds_one :skills
 end
  class Skills
  include Mongoid::Document
 
  field :skills, type => String
  field :desired, type => String
 
  embedded_in :user 
  end 
 

How do I fix my model and view so a person can add multiple skills and desired skills as sign up? (I am a rails beginner)

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