我试图在设计中嵌套一个类，它将用户的技能和所需的技能保存到一个数组中，但我似乎无法让我的表单对象保存到数组中。
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
如何修复我的模型和视图，以便一个人可以在注册时添加多种技能和所需技能？（我是 Rails 初学者）