url slug

referrer.rb

class Referrer < ActiveRecord::Base
  URL_SLUG_REGEX = /^[a-z0-9-]+$/i
  attr_accessible :token, :campaign, :campaign_id, :user_id, :lead_id
  belongs_to :campaign

  belongs_to :user
  belongs_to :lead

  has_many :referral_click_throughs

  has_many :referrals
  has_many :referred_leads, through: :referrals, source: :referee_lead
  has_many :referred_users, through: :referrals, source: :referee_user

  has_many :converted_referrals, -> { converted }, class_name: "Referral"

  validates_presence_of :token, :campaign_id
  validate :user_or_lead_is_present
  validate :token_sluggable
  validates_uniqueness_of :token
  before_validation on: :create do |record|
    record.ensure_unique
  end

  # Ensures that the token will be unique when created
  #
  #
  def ensure_unique(&block)
    if self['token'].blank?
      begin
        self['token'] = (block ? block.call : self.class.generate_unique)
      end while self.class.exists?('token' => self['token'])
    end
    self['token']
  end

  def self.generate_unique
    SecureRandom.hex(5)
  end

  def parent
    user || lead
  end

  def token_sluggable
    unless token.try(:match , URL_SLUG_REGEX )
      errors.add :token, "must contain only numbers, letters, hyphens"
    end
  end


  private
  def user_or_lead_is_present
    if user_id.blank? && lead_id.blank?
      errors[:base] << "user or lead must be present"
    end
  end
end