Rails 3：ActionMailer

Question

我在this Railscast這裏從我的rails應用程序發送郵件。

起初我試圖設置一個像本教程中的郵件攔截器，但我已經放棄了，因爲我總是有一個可愛的can't convert nil into Hash (TypeError)。

現在，我離開了攔截器，我想實際發送郵件，但你猜怎麼着 - 我的老朋友又回來了：

can't convert nil into Hash (TypeError) 

app/mailers/user_mailer.rb:20:in `registration' 

這裏的郵件類（行號20是一個與來電來郵）：

class UserMailer < ActionMailer::Base 

    def registration(user) 
    @invited = user 

    subject = 'Welcome!' 

    if Rails.env.development? 
     to = 'my.private@email.com' 
     subject = "to #{@invited.email}: #{subject}" 
    else 
     to = @invited.email 
    end 

    logger.info "Sending email to #{to} with subject #{subject}" 

    mail(:from => 'noreply@mysite.com', :to => to, :subject => subject) 
    end 
end 

日誌顯示：

invite entered for user foo@bar.com 
Sending email to foo@bar.com 
Sending email to my.private@email.com with subject to foo@bar.com: Welcome! 

而這裏的請求的視圖文件（對準配合文本）：

Welcome! 

blablah blah click the following link to activate blah blah <%= activate_user_path(@invited)%> blah blah. 
blah blah this is actually german (but plaintext) encoded in utf-8. 

VielVergnügenbeim Verwenden des Systems！

THX任何幫助

Answer 1

做到了，我有一個錯誤的ActionMailer的配置