ruby-on-rails - Rails - 电子邮件 View 中的邮件程序实例变量 Nil

Question

我正在尝试使用 railscasts 第 124 集(针对 rails 3.2.8 更新)中的结构创建测试版邀请。

目前，邀请电子邮件已发送，但不包含供用户关注以进行注册的 url(包括邀请 token )，因为我在 ActionMailer (@invitation_link) 中创建的实例变量在 View 中为零。检查 ActionMailer Controller 中的 @invitation_link 表明它指向正确的 url，但它在 View 中为零。

我还检查了以下问题，但没有一个解决方案对我有用:

How do you use an instance variable with mailer in Ruby on Rails?

https://stackoverflow.com/questions/5831038/unable-to-access-instance-variable-in-mailer-view

Actionmailer instance variable problem Ruby on Rails

ActionMailer pass local variables to the erb template

相关代码片段如下:

邀请_controller.rb

class InvitationsController < ApplicationController
  def new
    @invitation = Invitation.new
  end

  def create
    @invitation = Invitation.new(params[:invitation])
    @invitation.sender = current_user
    if @invitation.save
      if signed_in?
        InvitationMailer.invitation(@invitation).deliver
        flash[:notice] = "Thank you, invitation sent."
        redirect_to current_user
      else
        flash[:notice] = "Thank you, we will notify when we are ready."
        redirect_to root_url
      end
    else
      render :action => 'new'
    end
  end
end

在invitation_mailer.rb 文件中

class InvitationMailer < ActionMailer::Base
  default from: "holler@thesite.com", content_type: "text/html"

  def invitation(invitation)
    mail to: invitation.recipient_email, subject: "Invitation"
    @invitation_link = invited_url(invitation.token)
    invitation.update_attribute(:sent_at, Time.now)
  end
end

意见/invitation_mailer/invitation.text.erb

You are invited to join the site!

<%= @invitation_link %> # INSTANCE VARIABLE THAT IS NIL IN VIEW

route.rb(仅显示相关行)

match '/invited/:invitation_token', to:  'users#new_invitee', as: 'invited'

Answer 1

试试这个方法

这是您的 InvitationMailer

def invitation(invitation)
  @invitation = invitation
  mail(:to => @invitation.recipient_email, :subject => "Invitation")
end

现在，在您的 InvitationsController

if signed_in?
  @invitation.update_attribute(:sent_at, Time.now)
  InvitationMailer.invitation(@invitation).deliver
  ...
else
  ...
end

现在， views/invitation_mailer/invitation.text.erb

You are invited to join the site!
<%= invited_url(@invitation.token) %> # INSTANCE VARIABLE THAT IS NIL IN VIEW