如何在Rails 3中的redirect_to調用中允許自定義閃存密鑰

Question

在Rails 3中，您可以將屬性直接傳遞給redirect_to來設置閃存。例如：

redirect_to root_path, :notice => "Something was successful!" 

然而，這隻能與:alert和:notice鍵;如果你想使用自定義的按鍵，你必須使用一個更詳細的版本：

redirect_to root_path, :flash => { :error => "Something was successful!" } 

有沒有什麼辦法讓這個自定義鍵（如:error，以上）可以傳遞給redirect_to沒有具體說明在:flash => {}？

Answer 1

在Rails 4，你可以做到這一點

class ApplicationController < ActionController::Base 
    add_flash_types :error, ... 

，然後某處

redirect_to root_path, error: 'Some error' 

http://blog.remarkablelabs.com/2012/12/register-your-own-flash-types-rails-4-countdown-to-2013

Answer 2

我用下面的代碼，放置在lib/core_ext/rails/action_controller/flash.rb和加載通過初始化（它是內置的Rails代碼的重寫）：

module ActionController 
    module Flash 
    extend ActiveSupport::Concern 

    included do 
     delegate :alert, :notice, :error, :to => "request.flash" 
     helper_method :alert, :notice, :error 
    end 

    protected 
     def redirect_to(options = {}, response_status_and_flash = {}) #:doc: 
     if alert = response_status_and_flash.delete(:alert) 
      flash[:alert] = alert 
     end 

     if notice = response_status_and_flash.delete(:notice) 
      flash[:notice] = notice 
     end 

     if error = response_status_and_flash.delete(:error) 
      flash[:error] = error 
     end 

     if other_flashes = response_status_and_flash.delete(:flash) 
      flash.update(other_flashes) 
     end 

     super(options, response_status_and_flash) 
     end 
    end 
end 

你可以，當然，增加更多的按鍵除了剛纔:error ;查看http://github.com/rails/rails/blob/ead93c/actionpack/lib/action_controller/metal/flash.rb的代碼，查看最初的功能。