techvision/brails4

class Topic
  include Mongoid::Document
  include Mongoid::Slug


  field :title,       type: String
  field :seq_number,  type: Integer
  field :description, type: String

  slug :title

  belongs_to :level
  has_many :contents, dependent: :destroy
  embeds_many :comments, as: :commentable
  has_many :questions, as: :questionable, dependent: :destroy
  has_many :attempts, as: :attemptable, dependent: :destroy 

  validates :seq_number, :title, :presence => true
  validates :seq_number, numericality: { only_integer: true, :greater_than => 0 }

  accepts_nested_attributes_for :contents, :questions

  default_scope order_by(seq_number: :asc)

  #Return true if user has completed all contents and solved topic questions
  def complete?(user_id)
    user = User.find(user_id)
    self.contents.each do |content|
      return false unless content.complete?(user.id)
    end
    unless self.questions.empty? then
      self.questions.each do |question|
        return false unless question.answered?(user.id)
      end
    end
    return true
  end
end