Question

鉴于我的RewardMailer有以下预览：

class RewardMailerPreview < ActionMailer::Preview
  @mailman = 'mailman@mailman.ninja'
  @alice = User.create(email: 'ali@example.com')
  @bob = User.create(email: 'ali@example.com')
  @subject = 'I Vooshed my website'
  @btc_address = '1BitcoinKKKKKKKK'
  @amount = 0.004

  # Preview this email at http://localhost:3000/rails/mailers/reward_mailer/invoice_due
  def invoice_due
    RewardMailer.invoice_due(
      alice: @alice,
      subject: @subject,
      btc_address: @btc_address
    )
  end
end

我收到以下错误：

NoMethodError in Rails::MailersController#preview
undefined method `email' for nil:NilClass
Extracted source (around line #13):
 11   @alice = invoice_info[:alice]
 12   @subject = invoice_info[:subject]
 13   mail to: @alice.email, subject: @subject
 14 end

我的RewardMailer有行动：

  def invoice_due(invoice_info)
    @btc_address = invoice_info[:btc_address]
    @alice = invoice_info[:alice]
    @subject = invoice_info[:subject]
    mail to: @alice.email, subject: @subject
  end

并测试：

  test 'invoice_due' do
    mail = RewardMailer.invoice_due(
      alice: alice,
      subject: subject,
      btc_address: btc_address
    )
    assert_equal subject, mail.subject
    assert_equal [alice.email], mail.to
    assert_equal [mailman], mail.from
    assert_match btc_address, mail.body.encoded
  end

Answer 1

您在类级别设置@alice，但是您尝试从实例中读取它。我想你这样做是为了在不同的电子邮件中共享变量初始化代码？你可以这样做：

class RewardMailerPreview < ActionMailer::Preview
  def set_defaults
    @mailman = 'mailman@mailman.ninja'
    @alice = User.create(email: 'ali@example.com')
    @bob = User.create(email: 'ali@example.com')
    @subject = 'I Vooshed my website'
    @btc_address = '1BitcoinKKKKKKKK'
    @amount = 0.004
  end

  def invoice_due
    set_defaults
    RewardMailer.invoice_due(
      alice: @alice,
      subject: @subject,
      btc_address: @btc_address
    )
  end
end

ActionMailer :: Preview无法读取简单变量

1 个答案: