Question

我遵循本教程（http://ruby.railstutorial.org/chapters/sign-up#sec:signup_form）。但是，当代码在清单7.23 （转换为haml）

时

=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

我最终得到了双打印输出：预期的打印输出，然后是变量的打印输出

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>

我对rails编程非常陌生，但我真的无法获得。

谢谢，Marcello

Answer 1

您的if声明应以-开头，而不是=：

- if @user.errors.any?

你的循环也应该如此：

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

通常，如果您尝试将erb转换为haml，则<% ... %>变为- ...而<%= ... %>变为= ...

在HAML上双重打印实例变量

1 个答案: