尝试通过Rails ActionMailer发送一封电子邮件会导致调用'lookup_context.rb`内的`normalize_name`失败

Question

我有一个继承自ApplicationMailer的Mailer类，它继而继承自ActionMailer :: Base。 Ruby版本是ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin15]。

的梅勒类如下所示：

class PurchaseOrderStatusMailer < ApplicationMailer 
    CONTACTS = { 
    JC: ['me@example.com'], 
    RM: ['me@example.com'] 
    } 

    def daily_report_email(facility) 
    @facility = facility 
    ingredient_items = LineItem.ingredient.by_facility(facility) 
    @delivered_count = ingredient_items.by_date([7.days.ago, 7.days.from_now]).delivered.count 
    @partial_count = ingredient_items.by_date([7.days.ago, 1.day.ago]).partial.count 
    @late_count = ingredient_items.by_date([7.days.ago, 1.day.ago]).late.count 
    @expected_count = ingredient_items.by_date([Date.today, 7.days.from_now]).expected.count 
    mail(to: CONTACTS[facility.to_sym], subject: "#{facility} Daily Receipt Status - #{Date.today}") 
    end 
end 

ApplicationMailer如下所示：

# frozen_string_literal: true 
class ApplicationMailer < ActionMailer::Base 
    default from: 'notify@example.com' 

    def facility_email(facility) 
    emails = Rails.application.config_for(:emails) 
    (emails[facility] + emails["DEFAULT"]).flatten 
    end 
end 

视图位于app/views/purchase_order_status_mailer/daily_report_email.html.erb。

当我打开我的Rails控制台，输入PurchaseOrderStatusMailer.new.daily_report_email('JC').deliver，我看到以下错误：

NoMethodError: undefined method `empty?' for nil:NilClass 
from /Users/me/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/actionview-5.0.4/lib/action_view/lookup_context.rb:215:in `normalize_name' 

我想传递一个format块的调用mail助手用同一调用，就像这样：

mail(to: CONTACTS[facility.to_sym], subject: "#{facility} Daily Receipt Status - #{Date.today}") do |format| 
    format.text { render plain: "Hey!" } 
end 

上面产生了以下的反应，这似乎代表一个成功的电子邮件发送：

Rendering text template 
    Rendered text template (0.0ms) 
Sent mail to me@example.com (8.8ms) 
Date: Mon, 25 Sep 2017 12:55:11 -0400 
From: notify@example.com 
To: me@example.com 
Message-ID: <59c934efec401_1115b3fd69cc3f840917be@me-MBP.mail> 
Subject: JC Daily Receipt Status - 2017-09-25 
Mime-Version: 1.0 
Content-Type: text/plain; 
charset=UTF-8 
Content-Transfer-Encoding: 7bit 

Hey! 
=> #<Mail::Message:70191029273300, Multipart: false, Headers: <Date: Mon, 25 Sep 2017 12:55:11 -0400>, <From: notify@example.com>, <To: ["me@example.com"]>, <Message-ID: <59c934efec401_1115b3fd69cc3f840917be@me-MBP.mail>>, <Subject: JC Daily Receipt Status - 2017-09-25>, <Mime-Version: 1.0>, <Content-Type: text/plain>, <Content-Transfer-Encoding: 7bit>> 

我实际上没有收到电子邮件，我假设这意味着我没有在本地计算机上设置SMTP，但上述响应令人鼓舞。除了我上面发布的错误之外，没有任何堆栈跟踪，所以我尝试挖掘Rails源代码，并且我看到在args_for_lookup受保护的方法内lookup_context.rb内部的normalize_name被调用，而受保护的方法又被ViewPaths模块的find_all方法调用。但除此之外，很难追踪调用堆栈，因为我找不到调用者是谁。

我的问题是：第一次打电话给mail有什么问题？

编辑1：我也尝试format.html { render html: "<h1>Hello Mikel!</h1>".html_safe }而不是format.text选项，根据示例here，我收到了类似的成功消息。

然后，我尝试在normalize_name内添加一个byebug语句，尝试确定参数的值是否成功发送到电子邮件，但看起来像这个方法在块传递时没有被调用。这使我更加强烈地怀疑，这个问题与我的观点有某种关系。但我还不能确认。

Answer 1

我通过传递template_path和template_name选择原来的调用mail帮手，像这样能够产生success响应（包括我的邮件呈现的模板文件）：

mail(
    to: CONTACTS[facility.to_sym], 
    subject: "#{facility} Daily Receipt Status - #{Date.today}", 
    template_path: 'purchase_order_status_mailer', 
    template_name: 'daily_report_email') 

这产生以下成功回应：

Rendering purchase_order_status_mailer/daily_report_email.text.erb 
    Rendered purchase_order_status_mailer/daily_report_email.text.erb (0.3ms) 
Sent mail to me@example.com (12.1ms) 
Date: Mon, 25 Sep 2017 15:18:25 -0400 
From: notify@example.com 
To: me@example.com 
Message-ID: <59c9568121cec_11e943fee8503f82823542@me-MBP.mail> 
Subject: JC Daily Receipt Status - 2017-09-25 
Mime-Version: 1.0 
Content-Type: multipart/alternative; 
boundary="--==_mimepart_59c9568120033_11e943fee8503f8282341e"; 
charset=UTF-8 
Content-Transfer-Encoding: 7bit 


----==_mimepart_59c9568120033_11e943fee8503f8282341e 
Content-Type: text/plain; 
charset=UTF-8 
Content-Transfer-Encoding: 7bit 

Please find the receipt status for JC as of 09-25-2017: 
================================================================================================= 

...<lots more content, including ERB rendered into HTML>... 

=> #<Mail::Message:70293683934580, Multipart: true, Headers: <Date: Mon, 25 Sep 2017 15:18:25 -0400>, <From: notify@example.com>, <To: ["me@example.com"]>, <Message-ID: <59c9568121cec_11e943fee8503f82823542@me-MBP.mail>>, <Subject: JC Daily Receipt Status - 2017-09-25>, <Mime-Version: 1.0>, <Content-Type: multipart/alternative; boundary="--==_mimepart_59c9568120033_11e943fee8503f8282341e"; charset=UTF-8>, <Content-Transfer-Encoding: 7bit>> 

我有点困惑，为什么我不得不添加这些选项，如the documentation不说清楚，这些都需要nd我的模板和文件夹似乎正确命名，但它的工作，我有截止日期，所以我继续前进。 :-)