class Forum
  include Mongoid::Document
  include Mongoid::Timestamps
  include ActionView::Helpers::DateHelper

  field :name, :type => String
  field :description, :type => String
  field :active, type: Boolean, default: true
  field :last_post, :type => Time, default: Time.now
  field :slug, :type => String

  index :slug, :unique => true

  references_many :topics, :foreign_key => :topic_id, :class_name => 'Topic'

  before_create :set_slug

  scope :active, where(:active => true)

  validates_length_of :name, :maximum => 32
  validates_length_of :description, :maximum => 128

  def set_slug
    self.slug = self.name.downcase.gsub(/[^a-z0-9]/,"-")
  end

  def to_param
    self.slug
  end

end