ruby-on-rails - 仅当条件为真时如何添加到选项散列？

Question

在我的 Rails 项目中，我有这个邮件程序类:

class ProjectMailer < ActionMailer::Base

  def send_project_link(delivery)
    @delivery = delivery
    mail(:from     => @delivery.sender_email, 
         :to       => @delivery.recipient_email, 
         :bcc      => [@delivery.sender_email],
         :subject  => @delivery.subject)
  end

end

在散列中包含或不包含键/值对 :bcc 的最简洁方法是什么，具体取决于 true 还是 false 给出了吗？

感谢您的帮助。

Answer 1

mail(
  {
    from:    @delivery.sender_email, 
    to:      @delivery.recipient_email, 
    subject: @delivery.subject,
  }
  .tap{|h| h[:bcc] = [@delivery.sender_email] if @delivery}
)