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我有此代碼ROR grouped_options_for_select動態填入
鑑於grouped_options_for_select(@grouped_options, nil, @options_1)
在控制器
@options_1 = [africa]
@grouped_options = [['North America',[['United States','US'],'Canada']], ['Europe',['Denmark','Germany','France']]]
如何讓國家動態地從數組中填充一個不是一個接一個地輸入的國家?