带有 ActionMailer 的 Rake 任务 - 未定义的方法错误答案

【问题标题】：Rake Task w/ ActionMailer - Undefined Method Error带有 ActionMailer 的 Rake 任务 - 未定义的方法错误
【发布时间】：2016-09-06 19:32:53
【问题描述】：

我有一个自定义的 rake 任务，我正在使用一个邮件程序来完成这个任务。我有一个包含所有代理信息的代理表。我还有一个 agent_card 表，其中包含他们所有的许可证数据。 agent_card 表还有一个 agent_id 列来标识哪个卡与哪个代理一起使用。在尝试运行 rake 任务并发送邮件时，我不断收到“ActionView::Template::Error: undefined method `name' for nil:NilClass.”我不知道如何通过 agent_card 表获取姓名、电子邮件和电话。我已经包含了下面的所有代码。请，谢谢！

错误：

rake aborted!
ActionView::Template::Error: undefined method `name' for nil:NilClass
/Users/michaelwiesenhart/Code/app/views/license_expire_mailer/license_expi re_mgr.html.erb:7:in   `_app_views_license_expire_mailer_license_expire_mgr_html_erb___944550213720770297_70323524541360'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionview-4.2.6/lib/action_view/template.rb:145:in `block in render'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/activesupport-4.2.6/lib/active_support/notifications.rb:166:in `instrument'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionview-4.2.6/lib/action_view/template.rb:333:in `instrument'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionview-4.2.6/lib/action_view/template.rb:143:in `render'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionview-4.2.6/lib/action_view/renderer/template_renderer.rb:54:in `block (2 levels) in render_template'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionview-4.2.6/lib/action_view/renderer/abstract_renderer.rb:39:in `block in instrument'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/activesupport-4.2.6/lib/active_support/notifications.rb:164:in `block in instrument'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/activesupport-4.2.6/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/activesupport-4.2.6/lib/active_support/notifications.rb:164:in `instrument'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionview-4.2.6/lib/action_view/renderer/abstract_renderer.rb:39:in `instrument'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionview-4.2.6/lib/action_view/renderer/template_renderer.rb:53:in `block in render_template'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionview-4.2.6/lib/action_view/renderer/template_renderer.rb:61:in `render_with_layout'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionview-4.2.6/lib/action_view/renderer/template_renderer.rb:52:in `render_template'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionview-4.2.6/lib/action_view/renderer/template_renderer.rb:14:in `render'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionview-4.2.6/lib/action_view/renderer/renderer.rb:46:in `render_template'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionview-4.2.6/lib/action_view/renderer/renderer.rb:27:in `render'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionview-4.2.6/lib/action_view/rendering.rb:100:in `_render_template'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionview-4.2.6/lib/action_view/rendering.rb:83:in `render_to_body'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionpack-4.2.6/lib/abstract_controller/rendering.rb:25:in `render'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionmailer-4.2.6/lib/action_mailer/base.rb:904:in `block in collect_responses'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionmailer-4.2.6/lib/action_mailer/base.rb:918:in `each'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionmailer-4.2.6/lib/action_mailer/base.rb:918:in `each_template'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionmailer-4.2.6/lib/action_mailer/base.rb:900:in `collect_responses'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionmailer-4.2.6/lib/action_mailer/base.rb:829:in `mail'
/Users/michaelwiesenhart/Code/app/mailers/license_expire_mailer.rb:14:in `license_expire_mgr'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionpack-4.2.6/lib/abstract_controller/base.rb:198:in `process_action'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionpack-4.2.6/lib/abstract_controller/callbacks.rb:20:in `block in process_action'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/activesupport-4.2.6/lib/active_support/callbacks.rb:88:in `__run_callbacks__'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/activesupport-4.2.6/lib/active_support/callbacks.rb:778:in `_run_process_action_callbacks'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/activesupport-4.2.6/lib/active_support/callbacks.rb:81:in `run_callbacks'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionpack-4.2.6/lib/abstract_controller/callbacks.rb:19:in `process_action'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionpack-4.2.6/lib/abstract_controller/base.rb:137:in `process'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionview-4.2.6/lib/action_view/rendering.rb:30:in `process'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionmailer-4.2.6/lib/action_mailer/base.rb:596:in `block in process'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/activesupport-4.2.6/lib/active_support/notifications.rb:164:in `block in instrument'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/activesupport-4.2.6/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/activesupport-4.2.6/lib/active_support/notifications.rb:164:in `instrument'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionmailer-4.2.6/lib/action_mailer/base.rb:593:in `process'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionmailer-4.2.6/lib/action_mailer/base.rb:584:in `initialize'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionmailer-4.2.6/lib/action_mailer/message_delivery.rb:25:in `new'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionmailer-4.2.6/lib/action_mailer/message_delivery.rb:25:in `__getobj__'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionmailer-4.2.6/lib/action_mailer/message_delivery.rb:34:in `message'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/actionmailer-4.2.6/lib/action_mailer/message_delivery.rb:85:in `deliver_now'
/Users/michaelwiesenhart/Code/lib/tasks/license_expiration.rake:17:in `block (3 levels) in <top (required)>'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/activerecord-4.2.6/lib/active_record/relation/delegation.rb:46:in `each'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@global/gems/activerecord-4.2.6/lib/active_record/relation/delegation.rb:46:in `each'
/Users/michaelwiesenhart/Code/lib/tasks/license_expiration.rake:15:in `block (2 levels) in <top (required)>'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@/bin/ruby_executable_hooks:15:in `eval'
/Users/michaelwiesenhart/.rvm/gems/ruby-2.3.1@/bin/ruby_executable_hooks:15:in `<main>'

代理模型：

has_one :agent_card

代理卡型号：

belongs_to :agent

license_expire_mgr.html.erb

Hiya, <br><br>

The agent listed below has a license that will expire one week from today. Please make sure they renew before it expires!<br><br>

<strong>Name:</strong> <%= @agent.name %><br>
<strong>Phone:</strong> <%= @agent.phone %><br>
<strong>Email:</strong> <%= @agent.email %><br><br>

license_expire_mailer.rb

class LicenseExpireMailer < ActionMailer::Base
   default from: "Mike <help@mike.com>"

   def license_expire_mgr(agent_card, agent)
   @agent_cards = agent_card
   @agent = agent
   mail to: "mike@mike.com", subject: "Agent License Expiring"
  end
end

【问题讨论】：

标签： ruby-on-rails postgresql actionmailer rake-task

【解决方案1】：

@agent 没有传递给邮件程序，或者它的值被评估为nil。

问题不在于您的 rake 任务或邮件程序，找出参数为 nil 的原因，这将解决您的问题。

【讨论】：

我不知道为什么它是零。有一个与 agent_card 关联的代理。我删除了数据库，从备份中恢复。我不知道。
你必须检查agent的值，在这种情况下它必须是nil。
@BIlalKhan 我想这就是我要问的......我该怎么做？

【解决方案2】：

我想通了。我试图使用 agent_card 并且不需要它。一旦我删除它，它就可以正常工作！

【讨论】：