Ruby on rails Rails ActionMailer附件保留空白正文

我正在尝试用ActionMailer生成的电子邮件发送内联附件（图像）。然而，每次我添加一个附件，我总是得到一个空白的电子邮件正文。我试图生成一封简单的测试电子邮件来消除其他变量，但我一直遇到同样的问题

我使用的是Rails 3.2.13，下面是我的代码和失败的规范：

app/mailers/contact_mailer.rb

class ContactMailer < ActionMailer::Base
  default from: "support@example.com"

  def test
    attachments.inline['logo.png'] = File.read Rails.root.join('app/assets/images/emails/logo.png').to_s
    mail(to: 'my_email@gmail.com', subject: 'Testing, Testing')
  end

  def test_no_attachment
    mail(to: 'my_email@gmail.com', subject: 'Testing, Testing')
  end

<p>This is a test.</p>
<p>This is only a test.</p>
<%= image_tag attachments['mhbo_logo.png'].url %>

<p>This is a test.</p>
<p>This is only a test.</p>

require 'spec_helper'

describe ContactMailer do
  describe 'test' do
    it 'should send' do
      ContactMailer.test.deliver
      ActionMailer::Base.deliveries.count.should eq 1
      ActionMailer::Base.deliveries.last.body.should match /This is a test./
    end
  end

  describe 'test_no_attachment' do
    it 'should send' do
      ContactMailer.test_no_attachment.deliver
      ActionMailer::Base.deliveries.count.should eq 1
      ActionMailer::Base.deliveries.last.body.should match /This is a test./
    end
  end
end

module TestingMacros
  def last_email_html_body
    ActionMailer::Base.deliveries.last.body.parts.detect{|p| p.content_type.match(/text\/html/)}.body
  end
end

…
last_email_html_body.should match /This is a test./
…

第二次测试通过，但第一次测试失败，原因如下：

 Failure/Error: ActionMailer::Base.deliveries.last.body.should match /This is a test./
   expected  to match /This is a test./
 # ./spec/mailers/contact_mailer_spec.rb:8:in `block (3 levels) in <top (required)>'

失败/错误：ActionMailer:：Base.deliveries.last.body.should match/这是一个测试/
预期匹配/这是一个测试/
#./spec/mailers/contact_-mailer_-spec.rb:8:in'block（3层）in'

因此，这封电子邮件的正文是空白的

我的代码可能有什么问题？还是我测试的方式有问题？我测试过许多其他具有相同语法的电子邮件，但没有一封带有附件。我还感到困惑，因为我认为添加附件会发送多部分电子邮件，因此

ActionMailer:：Base.deliveries.count

将大于1。我弄错了吗

---

我在这里有点迷路了，所以非常感谢所有的帮助。

结果表明，我没有正确地测试电子邮件内容。多部分电子邮件（如带有附件的电子邮件）作为单个电子邮件发送，但包含多个部分，访问方式如下：

ActionMailer::Base.deliveries.last.body.parts

因此，为了找到与HTML主体对应的部分，我编写了以下测试：

ActionMailer::Base.deliveries.last.body.parts.detect{|p| p.content_type.match(/text\/html/)}.body.should match /This is a test./

我将此代码重构为宏，以使测试更具可读性：

spec/macros/testing_macros.rb

class ContactMailer < ActionMailer::Base
  default from: "support@example.com"

  def test
    attachments.inline['logo.png'] = File.read Rails.root.join('app/assets/images/emails/logo.png').to_s
    mail(to: 'my_email@gmail.com', subject: 'Testing, Testing')
  end

  def test_no_attachment
    mail(to: 'my_email@gmail.com', subject: 'Testing, Testing')
  end

<p>This is a test.</p>
<p>This is only a test.</p>
<%= image_tag attachments['mhbo_logo.png'].url %>

<p>This is a test.</p>
<p>This is only a test.</p>

require 'spec_helper'

describe ContactMailer do
  describe 'test' do
    it 'should send' do
      ContactMailer.test.deliver
      ActionMailer::Base.deliveries.count.should eq 1
      ActionMailer::Base.deliveries.last.body.should match /This is a test./
    end
  end

  describe 'test_no_attachment' do
    it 'should send' do
      ContactMailer.test_no_attachment.deliver
      ActionMailer::Base.deliveries.count.should eq 1
      ActionMailer::Base.deliveries.last.body.should match /This is a test./
    end
  end
end

module TestingMacros
  def last_email_html_body
    ActionMailer::Base.deliveries.last.body.parts.detect{|p| p.content_type.match(/text\/html/)}.body
  end
end

…
last_email_html_body.should match /This is a test./
…

spec/mailer/contact\u mailer\u spec.rb

class ContactMailer < ActionMailer::Base
  default from: "support@example.com"

  def test
    attachments.inline['logo.png'] = File.read Rails.root.join('app/assets/images/emails/logo.png').to_s
    mail(to: 'my_email@gmail.com', subject: 'Testing, Testing')
  end

  def test_no_attachment
    mail(to: 'my_email@gmail.com', subject: 'Testing, Testing')
  end

<p>This is a test.</p>
<p>This is only a test.</p>
<%= image_tag attachments['mhbo_logo.png'].url %>

<p>This is a test.</p>
<p>This is only a test.</p>

require 'spec_helper'

describe ContactMailer do
  describe 'test' do
    it 'should send' do
      ContactMailer.test.deliver
      ActionMailer::Base.deliveries.count.should eq 1
      ActionMailer::Base.deliveries.last.body.should match /This is a test./
    end
  end

  describe 'test_no_attachment' do
    it 'should send' do
      ContactMailer.test_no_attachment.deliver
      ActionMailer::Base.deliveries.count.should eq 1
      ActionMailer::Base.deliveries.last.body.should match /This is a test./
    end
  end
end

module TestingMacros
  def last_email_html_body
    ActionMailer::Base.deliveries.last.body.parts.detect{|p| p.content_type.match(/text\/html/)}.body
  end
end

…
last_email_html_body.should match /This is a test./
…

---

因为这让我明白，如果有附件，我需要处理email.body.parts，而不仅仅是将email.body直接呈现为HTML blob。谢谢你带我去那里。