phrases_controller.rb

class PhrasesController < ApplicationController
  def index
    set_cookies
    @phrases_left = avaible_ids(cookies[:showed_ph]).count
    @phrases = Phrase.find(cookies_to_array(cookies[:showed_ph]))
  end
 
  def random_phrase
    all_ids = avaible_ids(cookies[:showed_ph])
    @phrases_left = all_ids.count - 1
    respond_to do |format|
      if all_ids.count != 0
        id = all_ids.sample
        cookies[:showed_ph] +=  "#{id} "
        @phrase = Phrase.find(id)
        format.js {}
      else
        format.js { render js: 'alert("no more phrases in db");' }
      end
    end
  end
 
  def clear_phrases
    cookies.delete(:showed_ph)
    set_cookies
    @phrases_left = Phrase.count
    respond_to { |f| f.js }
  end
 
  private
 
  def avaible_ids(showed_phrases)
    (1..Phrase.count).to_a - cookies_to_array(showed_phrases)
  end
 
  def cookies_to_array(cookie)
    cookie.split(' ').map(&:to_i)
  end
 
  def set_cookies
    cookies.permanent[:showed_ph] ||= ""
  end
end