無法添加「：include_blank =>」請選擇「」爲Rails 3.2選項選擇語言（初學者）

Question

初學者問題 我試圖在行select中添加{:include_blank => "Please select"}。

%label Please choose the language you speak 
.user-profile-select 
    %select{id: "user_language_language_id"} 
    - Language.active.each do |lang| 
     %option{value: lang.id}= lang.to_label 
%input{type: "button", value: "ADD", id: "add_user_language"} 

%span.note You can choose few 

:coffeescript 
    $("#add_user_language").click -> 
    $.post #{my_user_languages_path.to_json}, 
     format: 'js' 
     user_language: 
     language_id: $("#user_language_language_id").val() 

    false 

我得到哈姆錯誤或保持不變。誰能解釋我做錯了什麼？

Answer 1

%label Please choose the language you speak 
.user-profile-select 
    %select{id: "user_language_language_id"} 
    %option{class: "prompt"} Please Select 
    - Language.active.each do |lang| 
     %option{value: lang.id}= lang.to_label 
    %input{type: "button", value: "ADD", id: "add_user_language"} 

%span.note You can choose few  

您可以在每個循環之前提供默認的「選項」標籤。 您可以使用表單助手方法（select），您可以在其中傳遞數組和提示值。

select("lang", "lang_id", Language.active.collect {|p| [ p.name, p.id ] }, {:prompt => 'Please Select'})