ruby-on-rails – 将变量传递给块 – Rails

参见英文答案 > How does instance_eval work and why does DHH hate it?????????????????????????????????????3个
在我的rails应用程序中,我使用此gem与Gmail API进行交互： https://github.com/gmailgem/gmail

以下是我发送电子邮件的方法：

gmail = Gmail.connect(params[:email],params[:password])
@email = params[:email]

email = gmail.compose do
  to @email
  subject "Having fun in Puerto Rico!"
  body "Spent the day on the road..."
end
email.deliver!

我收到此错误：

An SMTP To address is required to send a message. Set the message smtp_envelope_to,to,cc,or bcc address.

电子邮件变量无法传递到块中.是什么造成的？如何传递动态电子邮件地址？

email_to = params[:email]
email = gmail.compose do
    to email_to
    ...
end