在HAML上雙重打印實例變量

Question

我正在學習本教程（http://ruby.railstutorial.org/chapters/sign-up#sec:signup_form）。然而，當清單代碼在7.23（轉換爲HAML）

=if @user.errors.any? 
%div{:id => "error_explanation"} 
    %div{:class=>"alert alert-error"} 
    il modulo contiene errori 
    %ul 
     = @user.errors.full_messages.each do |msg| 
     %li 
      = msg 

我結束了一個雙重打印：預期的一個，接着是排序變量

Name can't be blank 
Password is too long (maximum is 15 characters) 
["Name can't be blank", "Password is too long (maximum is 15 characters)"] 
<h1>Registrazione nuovo utente</h1> <div id='error_explanation'> <div class='alert alert-error'> il modulo contiene errori <ul> <li> Name can't be blank </li> <li> Password is too long (maximum is 15 characters) </li> [&quot;Name can't be blank&quot;, &quot;Password is too long (maximum is 15 characters)&quot;]</ul> </div> </div> 

我的打印輸出的對於rails編程來說真的很陌生，但我真的無法得到。

感謝，馬塞羅

Answer 1

你if語句應該以-，不是=開始：

- if @user.errors.any? 

和你的循環應該太：

- @user.errors.full_messages.each do |msg| 

一般來說，如果你是試圖從erb轉換爲haml，<% ... %>變成- ...和<%= ... %>變成= ...