gistfile1.rb

#coding: UTF-8
class ApplicationController < ActionController::Base
  protect_from_forgery
  before_filter :fetch_bottom_carousel, :fetch_sidebar
  before_filter :pass_user_to_js, :pass_article_to_js
  helper_method :paginating?, :current_article, :current_article?, :current_paginating

  def authenticate_active_admin_user!
    authenticate_user!
    unless current_user.role?('admin') || current_user.role?('editor')
      redirect_to root_path, alert: 'Unauthorized Access!'
    end
  end

  # редиректим на страницу, где был напечатан комментарий
  def after_sign_in_path_for(resource)
    if cookies[:path]
      cookies[:path]
      cookies.delete :path
    else
      super
    end
  end

  def fetch_sidebar
    @articles = Article.excluding_categories(['спецпроекты'])
    @sidebar_articles = case
    when paginating?
      exclude_ids = articles_to_exlude_when_paginating | @bottom_carousel_articles
      @articles.excluding_ids(exclude_ids).sample(3)
    when current_article?
      related_articles = current_article.related_articles
      exclude_ids = related_articles | [current_article] | @bottom_carousel_articles
      related_articles + @articles.excluding_ids(exclude_ids).sample(3 - related_articles.count)
    else
      @articles.excluding_ids(@bottom_carousel_articles).sample(3)
    end
  end

  # как тут исключить статьи из сайдбара?

  def fetch_bottom_carousel
    @articles = Article.excluding_categories(['спецпроекты'])
    @bottom_carousel_articles = case
    when paginating?
      @articles.excluding_ids(articles_to_exlude_when_paginating).sample(9)
    when current_article?
      @articles.excluding_ids([current_article]).sample(9)
    else @articles.sample(9)
    end
  end

  def current_ability
    @current_ability ||= Ability.new(current_user)
  end

  rescue_from CanCan::AccessDenied do |exception|
    redirect_to admin_dashboard_path, :alert => exception.message
  end

  def pass_user_to_js
    gon.user = {
      id:     current_user.try(:id),
      email:  current_user.try(:email),
      guest:  !current_user
    }
  end

  def pass_article_to_js
    if controller_name == 'articles' && action_name == 'show'
      gon.article = {id: params[:id]}
    end
  end

  def load_modal
    render partial: "shared/modals/#{params[:modal]}"
  end


  private

  def paginating?
    params[:page] && controller_name == 'articles'
  end

  def current_paginating
    return unless paginating?
    params[:page].to_i
  end

  def articles_to_exlude_when_paginating
    return unless paginating? && current_paginating
    Article.limit(8).offset((current_paginating - 1)* 8)
  end

  def current_article?
    controller_name == 'articles' && action_name == 'show'
  end

  def current_article
    return false unless current_article?
    Article.find_by_id(params[:id])
  end
end