nodes_controller.rb

def show

    url = request.original_url
    if url.last == '?'
      redirect_to url.chop and return
    end

    params[:name] = 'russia' if params[:name].blank?

    @node = Node.find_by(name: params[:name])
    @sidebar = @node.articles.joins(:categories).published
                   .where(categories: {name: 'sidebar'}).to_a + @node.groups.all.to_a
    @sidebar = @sidebar.sort_by{ |obj| obj.priority } if @sidebar.present?
    @application_form = ApplicationForm.new
    @articles = []

    if params[:name] == 'review-post'
      if params[:id_or_urlname] # ApplicationForm id
        review = ApplicationForm.published.find_by(id: params[:id_or_urlname])
        @articles = [review] if review
      end
    elsif params[:name] == 'reviews'
      @articles = ApplicationForm.published.order(review_date: :desc)
    elsif params[:name].in? %w(blog offers)
      # url - ?cat_id[]=1&cat_id[]=2
      if params[:cat_id].blank?
        if params[:name] == 'blog'
          params[:cat_id] = [6]
        elsif params[:name] == 'offers'
          params[:cat_id] = [11]
        end
      end

      category_ids = params[:cat_id].map{ |s| s.to_i_nn }.compact.uniq
      @articles = Article.joins(:categories).published
                      .without_categories.with_categories(category_ids)
                      .uniq.order(created_at: :desc)

    elsif params[:name].in? %w(russia blog-post offer-post)

      # start page
      if params[:id_or_urlname].blank? && params[:name] == 'russia'
        # здесь бывает params[:reach_goal]
        params[:id_or_urlname] = '2'
      end

      if params[:id_or_urlname] # Article id_or_urlname
        if params[:id_or_urlname].first.to_i > 0
          article = Article.published.find_by(id: params[:id_or_urlname])
          if article
            path_hash = { action: 'show', name: params[:name],
                          id_or_urlname: article.url_name }

            if params[:reach_goal].present?
              path_hash.merge!(reach_goal: params[:reach_goal])
            end

            redirect_to(path_hash, status: 301) and return
          end
        else
          article = Article.published.find_by(url_name: params[:id_or_urlname])
          @articles = [article] if article
        end
      end
    end

    if @articles.empty?
      render_404 and return
    else
      store_location
    end

    respond_to do |format|
      format.html
      format.js
    end

  end

routes.rb

Rails.application.routes.draw do
    get ':name(/:id_or_urlname)' => 'nodes#show', :as => 'node'
end