在模型中访问rails flash [：notice]

I am trying to assign a message to flash[:notice] in a model observer.

我试图在模型观察者中为flash [：notice]分配一条消息。

This question has already been asked: Ruby on Rails: Observers and flash[:notice] messages?

这个问题已经被问到：Ruby on Rails：Observers和flash [：notice]消息？

However, I get the following error message when I try to access it in my model:

但是，当我尝试在我的模型中访问它时，我收到以下错误消息：

undefined local variable or method `flash' for #<ModelObserver:0x2c1742c>

Here is my code:

这是我的代码：

class ModelObserver < ActiveRecord::Observer
  observe A, B, C

  def after_save(model)
    puts "Model saved"
    flash[:notice] = "Model saved"
  end
end

I know the method is being called because "Model saved" is printed to the terminal.

我知道正在调用该方法，因为“模型保存”被打印到终端。

Is it possible to access the flash inside an observer, and if so, how?

是否有可能在观察者中访问闪存，如果是这样，如何？

2 个解决方案

#1

I needed to set flash[:notice] in the model to override the generic "@model was successfuly updated".

我需要在模型中设置flash [：notice]来覆盖泛型“@model was successfuly updated”。

This what I did

这就是我做的

Created a virtual attribute in the respective model called flash_notice
在相应的模型中创建了一个名为flash_notice的虚拟属性
Then I set the virtual attribute in the respective model when needed
然后我在需要时在相应的模型中设置虚拟属性
Used an after_filter when this virtual attribute was not blank to override the default flash
当此虚拟属性不为空时使用after_filter来覆盖默认闪存

You can see my controller and model how I accomplished this below:

你可以看到我的控制器和模型，我在下面完成了这个：

class Reservation < ActiveRecord::Base

  belongs_to :retailer
  belongs_to :sharedorder
  accepts_nested_attributes_for :sharedorder
  accepts_nested_attributes_for :retailer

  attr_accessor :validation_code, :flash_notice

  validate :first_reservation, :if => :new_record_and_unvalidated

  def new_record_and_unvalidated
    if !self.new_record? && !self.retailer.validated?
      true
    else
      false
    end
  end

  def first_reservation
    if self.validation_code != "test" || self.validation_code.blank?
      errors.add_to_base("Validation code was incorrect") 
    else
      self.retailer.update_attribute(:validated, true)
      self.flash_notice = "Your validation as successful and you will not need to do that again"
    end
  end
end

class ReservationsController < ApplicationController

  before_filter :authenticate_retailer!
  after_filter :flash_notice, :except => :index

  def flash_notice
    if !@reservation.flash_notice.blank?
      flash[:notice] = @reservation.flash_notice
    end
  end
end

#2

No, you set it in the controller where the saving is occurring. flash is a method defined on ActionController::Base.

不，您将其设置在正在进行保存的控制器中。 flash是ActionController :: Base上定义的方法。

#1