ruby-on-rails-3 - Rails 在 grouped_collection_select 中选择一个字段

Question

我在 View 中使用此代码来创建选择grouped_collection_select(:query, :city_id, @states, :cities, :name, :id, :name, {:selected => "Chicago"}) 看起来像这样:

我希望默认选择“芝加哥”。我怎样才能让它发挥作用？

Answer 1

您好，在上面的示例中，您可以通过定义选定的芝加哥关键索引来选择“芝加哥”。

这是一个例子:

 @city_group =
                 [
                 ["Wisoncin", [["Lake Geneva", "1"], 
                 ["Elkhart Lake", "2"]]],
                 ["Michigan", [["Harbor Country", "3"], ["Traverse City", "4"]]],
                 ["Indiana", [["Bloomington", "5"], ["Valparaiso", "6"]]],
                 ["Minnesota", [["Twin Cities", 
                 "7"], ["Bloomington", "8"], ["Stillwater", 
                 "9"]]],
                 ["Florida", [["Sanibel & Captiva", "10"]]],
                 ["Illinois", [["Chicago", "11"], 
                 ["Galena", "12"]]],
                 ]

并在您的 View 中添加以下内容:

<%= select_tag(:brand_id, grouped_options_for_select(@city_group, selected_key = "11", prompt = nil)) %>

希望对您有帮助!享受!