问Rails 4:将不同的布局应用于特定的控制器操作

EN

class PagesController < ApplicationController
  def home
    render :layout => 'homepage'
  end
end

class PagesController < ApplicationController
  def home
    render :layout => 'homepage'
  end
  def help
    render :layout => 'helppage'
  end
end

class PagesController < ApplicationController

  before_action :authenticate_user!, :only => [:help]

  def home
    [...]
    render :layout => 'homepage'
  end

  def features
  end

  def pricing
  end

  def about
  end

  def contact
  end

  def feedback
  end

  def press
  end

  def help
    render :layout => 'helppage'
  end

  def privacy
  end

  def terms
  end

  def career
  end

  def help
  end

  def faq
  end

  def guides
  end

  def support
  end

  def investors
  end

end

class ApplicationController < ActionController::Base

  # include Pundit

  protect_from_forgery with: :exception

  before_action :configure_permitted_parameters, if: :devise_controller?

  # after_action :verify_authorized, :except => :index

  def after_sign_in_path_for(resource)
    sign_in_url = new_user_session_url
    if request.referer == sign_in_url
      super
    else
      stored_location_for(resource) || request.referer || root_path
    end
  end

  protected

  def configure_permitted_parameters
    devise_parameter_sanitizer.for(:sign_up) { |u| u.permit(:first_name, :last_name, :company_name, :email, :password, :password_confirmation, :time_zone, :company_type, :expert, :expert_approval, :category, :description, :portfolio, :price, :avatar, :first_reference, :second_reference, :third_reference, :location) }
    devise_parameter_sanitizer.for(:account_update) { |u| u.permit(:first_name, :last_name, :company_name, :email, :password, :current_password, :password_confirmation, :time_zone, :company_type, :expert, :expert_approval, :category, :description, :portfolio, :price, :avatar, :first_reference, :second_reference, :third_reference, :location) }
  end

  def user_for_paper_trail
    user_signed_in? ? current_user.try(:id) : "Unknow User"
  end

  def facebook_copy_link(string)
    require "uri"
    array = URI.extract(string.to_s)
    array.select { |item| item.include? ( "http" || "www") }.first
  end

end