Rails 4.2 Active Job Resque Enqueue Undefined Method 问题

Question

我正在关注https://blog.engineyard.com/2014/getting-started-with-active-job 在 Rails 4.2 中实现 Active Job。但在 Resque 中面临以下问题。错误读取：

Worker
ChickenSmitten.local:64238 on EMAIL at just now Retry or Remove
Class
 ActiveJob::QueueAdapters::ResqueAdapter::JobWrapper
Arguments
---
job_class: PasswordResetJob
job_id: 35f70043-9a9b-4add-8700-a5f388350fb4
queue_name: email
arguments:
- bob@example.com
Exception
NoMethodError
Error
undefined method `email' for "bob@example.com":String

我的代码如下：

password_resets_controller.rb

  def create
    @user = User.find_by(email: params[:password_reset][:email].downcase)
    if @user
      @user.create_reset_digest
      @user.send_password_reset_email
      flash[:notice] = "Email sent with password reset instructions"
      redirect_to root_url
    else
      flash.now[:error] = "Email address not found"
      render 'new'
    end
  end

用户.rb

  def send_password_reset_email
    PasswordResetJob.new(self.email).enqueue(wait: 10.seconds)
  end  

app/jobs/password_reset_job.rb

class PasswordResetJob < ActiveJob::Base
  queue_as :email

  def perform(email)
    UserMailer.password_reset(email).deliver_now
  end
end

app/mailers/user_mailer.rb

class UserMailer < ActionMailer::Base
  default from: "noreply@example.com"

  def password_reset(user)
    @user = user
    mail to: user.email, subject: "Password Reset"
  end

end

不知何故，来自 user.rb 的“self.email”没有传递给 password_reset_job.rb。因此，“bob@example.com”的错误“未定义方法`email'：String”。

提前致谢。

更新

根据 Prakash 的建议并进行如下更改，将“self.email”更改为“self”：

  def send_password_reset_email
    PasswordResetJob.new(self).enqueue(wait: 10.seconds)
  end 

弹出一个新错误。这是错误：

ActionView::Template::Error
No route matches {:action=>"edit", :controller=>"password_resets", :email=>"bob@example.com", :format=>nil, :id=>nil} missing required keys: [:id]

以下是可能有所帮助的更多详细信息。

[2] pry(#<User>)> PasswordResetJob.new(self).enqueue(wait: 10.seconds)
[ActiveJob] Enqueued PasswordResetJob (Job ID: 6bdcca3c-367d-48ea-b3c9-1f5378e5df57) to Resque(email) at 2015-01-06 04:58:28 UTC with arguments: gid://affiliation/User/1
=> #<PasswordResetJob:0x007fbd4c028dc8
 @arguments=
  [#<User:0x007fbd4b686590
    id: 1,
    username: "bob",
    email: "bob@example.com",
    password_digest: "$2a$10$dbbEBwNgBtaZEvtl7EsUm./hdukr3MMKlUWdouV3RwIFMmMPfR6CS",
    created_at: Thu, 01 Jan 2015 03:38:54 UTC +00:00,
    updated_at: Tue, 06 Jan 2015 04:58:01 UTC +00:00,
    role: "admin",
    slug: "bob",
    activation_digest: "$2a$10$wdoO7vn5Ng4U4TEPCmqVFeVYAB8sZ2CKEpVFfduYyD7Ee.NfvSRsi",
    activated: true,
    activated_at: Thu, 01 Jan 2015 03:41:19 UTC +00:00,
    remember_digest: nil,
    reset_digest: "$2a$10$Eu1jYllohAY2IQO4Uc.0TuyNmRWWuu3jQgjZrIZLwFlo1t8n1hNZO",
    reset_sent_at: Tue, 06 Jan 2015 04:58:01 UTC +00:00,
    url: "www.google.com",
    bio: "Woo ga shaka.">],
 @job_id="6bdcca3c-367d-48ea-b3c9-1f5378e5df57",
 @queue_name="email",
 @scheduled_at=1420520308.6658938>

views/user_mailer/password_reset.html.rb

<h1>Password reset</h1>

<p>To reset your password click the link below:</p>

<%= link_to "Reset password", edit_password_reset_url(@user.reset_token,
                                                      email: @user.email) %>

<p>This link will expire in two hours.</p>

<p>
If you did not request your password to be reset, please ignore this email and
your password will stay as it is.
</p>

Answer 1

您将电子邮件传递给 PasswordResetJob，后者将其传递给邮件程序，但邮件程序需要一个用户实例。

PS：你可以直接在模型中做 UserMailer.password_reset(self.email).deliver_later。见http://api.rubyonrails.org/classes/ActionMailer/MessageDelivery.html#method-i-deliver_later

Answer 2

def perform(email)
  UserMailer.password_reset(email).deliver_now
end

这是用email 调用UserMailer 中的password_reset 方法（在这种特定情况下，其值为bob@example.com。

def password_reset(user)
  @user = user
  mail to: user.email, subject: "Password Reset"
end

所以在password_reset 方法中，user 被设置为bob@example.com，因此在调用user.email 时失败。

解决此问题的一种方法是使方法如下：

app/mailers/user_mailer.rb

class UserMailer < ActionMailer::Base
  default from: "noreply@example.com"

  def password_reset(email)
    mail to: email, subject: "Password Reset"
  end

end

您可能需要根据具体需求寻找不同的方式。