Rake任務w/ActionMailer - 未定義方法錯誤

Question

我有一個自定義rake任務，我正在使用此任務的郵件程序。我有一個包含代理信息的代理表。我還有一個agent_card表，其中包含所有許可證數據。 agent_card表還具有agent_id列以標識哪個卡與哪個代理程序一起使用。當試圖運行rake任務併發送郵件時，我不斷收到「ActionView :: Template :: Error：undefined method'name'for nil：NilClass。」我無法弄清楚如何通過agent_card表獲取姓名，電子郵件和電話。我已經包含了下面的所有代碼。謝謝，麻煩您了！

錯誤：

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>' 

代理型號：

has_one :agent_card 

AgentCard型號：

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 

Answer 1

我想通了。我試圖使用agent_card並不需要它。一旦我刪除它，它工作得很好！

Answer 2

@agent沒有被通過到所述郵件收發器或者它的值傳遞被評價爲nil。

問題不在於你的耙子任務或你的郵件，找出爲什麼這個參數是nil，這將解決你的問題。