Rails 在 grouped_collection_select 中选择一个字段 [英] Rails selecting a field in grouped_collection_select

问题描述

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

I'm using this code in my view to create a selection grouped_collection_select(:query, :city_id, @states, :cities, :name, :id, :name, {:selected => "Chicago"}) that looks like this:

我想默认选择芝加哥".我怎样才能让它工作?

I want to have "Chicago" selected by default. How can I get this to work?

推荐答案

在上面的示例中，您可以通过定义芝加哥的选定键索引来选择芝加哥".

Hi on your sample above you can select "Chicago" by defining the selected key index of chicago.

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"]]],
                 ]

并在您的视图中添加:

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

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