slugeable.rb

module Slugeable
  extend ActiveSupport::Concern

  included do
    extend FriendlyId
    friendly_id :slug_candidates, use: :slugged

    def slug_candidates
      if defined?(self.posted_at)
        "#{posted_at}-#{name}"
      elsif defined?(self.date)
        "#{date}-#{name}"
      else
        :name
      end
    end

    def normalize_friendly_id(name)
      if slug.blank?
        name.to_slug.normalize! :transliterations => :russian
      else
        slug.to_slug.normalize! :transliterations => :russian
      end
    end

    def should_generate_new_friendly_id?
      new_record? || slug.blank? || self.class.find_by_slug(slug).nil?
    end
  end
end