Question

我正在研究Ryan Bates的Railscast＃124：Beta邀请。我已经准备好了所有代码，但我还有两个问题。

会话不会在电子邮件发送过程中持续存在。出于某种原因，当签名时在用户向朋友发送邀请时，应用会注销用户。
在用户中签名无法发送电子邮件。我收到一条错误消息关于拥有错误数量的论点。

我认为这两个问题并不相关，但考虑到它们的可能性，我认为我应该同时提及这两个问题。有没有人知道为什么我遇到这两个问题？

以登录用户身份发送电子邮件邀请时出现错误消息：

    ArgumentError in InvitationsController#create

    wrong number of arguments (0 for 2)
    Rails.root: /*********/MyApp

    Application Trace | Framework Trace | Full Trace
    app/mailers/user_mailer.rb:10:in `invitation'
    app/controllers/invitations_controller.rb:16:in `create'

控制器

class InvitationsController < ApplicationController

  def new
    @invitation = Invitation.new
  end

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

end

寄件人/ User_Mailer.rb。第10行是“def邀请（邀请，signup_path）”。

class UserMailer < ActionMailer::Base
  default :from => "********"

  def registration_confirmation(user)
    @user = user
    attachments["rails.png"] = File.read("#{Rails.root}/app/assets/images/rails.png")
    mail(:to => "#{user.name} <#{user.email}>", :subject => "Registered")
  end

  def invitation(invitation, signup_path)
    subject    'Invitation'
    recipients invitation.recipient_email
    body       :invitation => invitation, :signup_url => signup_path
    invitation.update_attribute(:sent_at, Time.now)
  end


end

模型/ invitation.rb

class Invitation < ActiveRecord::Base

  belongs_to :sender, :class_name => 'User'
  has_one :recipient, :class_name => 'User'

  validates_presence_of :recipient_email
  validate :recipient_is_not_registered
  validate :sender_has_invitations, :if => :sender

  before_create :generate_token
  before_create :decrement_sender_count, :if => :sender

  private

  def recipient_is_not_registered
    errors.add :recipient_email, 'is already registered' if User.find_by_email(recipient_email)
  end

  def sender_has_invitations
    unless sender.invitation_limit > 0
      errors.add_to_base 'You have reached your limit of invitations to send.'
    end
  end

  def generate_token
    self.token = Digest::SHA2.hexdigest([Time.now, rand].join)
  end

  def decrement_sender_count
    sender.decrement! :invitation_limit
  end

end

的routes.rb

resources :users, :invitations
resources :sessions, :only => [:new, :create, :destroy]

match '/signup/',  :to => 'users#new'
match '/signup/:invitation_token', :to => 'users#new'
match '/signin',  :to => 'sessions#new'
match '/signout', :to => 'sessions#destroy'
match '/contact', :to => 'pages#contact'
match '/about',   :to => 'pages#about' 
match '/help',    :to => 'pages#help'

root :to => "pages#home"
match ':controller(/:action(/:id(.:format)))'

Answer 1

如果您直接从代码中复制了此内容，则会有一个额外的点，导致您在此行中出现异常：

UserMailer.invitation.(@invitation, signup_path(@invitation.token)).deliver

邀请和（

之间不应该有点

Answer 2

好吧，这就是导致会话持久性问题：

邀请函中的

邀请模型，相关部分

belongs_to :sender, :class_name => 'User'
[...]
before_create :decrement_sender_count, :if => :sender
[...]
def decrement_sender_count
  sender.decrement! :invitation_limit
end

在查看日志之后，我看到减量！方法在某种程度上认为更新数据库中的 remember_token 也很有趣。然后是cookie中的 remember_token 已不再有效。我想出的第一个丑陋的解决方法是：

def decrement_sender_count
  # sender.decrement! :invitation_limit
  limit = sender.invitation_limit
  sender.update_attributes(:invitation_limit => (limit.to_i-1))      
end

我会问另一个问题，找出那里有ActiveRecord的内容。请参阅更好的答案here。

Rails邮件程序存在会话持久性和发送电子邮件的问题

2 个答案: