ROR grouped_options_for_select dynamic populate

I have this code

in view

grouped_options_for_select(@grouped_options, nil, @options_1)

in controller

@options_1 = [africa]

@grouped_options = [['North America',[['United States','US'],'Canada']], ['Europe',['Denmark','Germany','France']]]

how to make the countries populate dynamically from an array an not type them one by one?


for those who might be interested... this what i did

in view

options_for_select(@options, :disabled => ['North America', 'Europe']

in controller

@countries.each do |l|
    @options << [,]

for this output

Africa North America      United States, US      Canada Europe      Denmark      Germany      France

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