Grouped Select in Rails

Question

Simple question really - how do I use the select(ActionView::Helpers::FormOptionsHelper) with grouped options?

I have got it working with a select_tag (ActionView::H

Answer 1

You can also use a Hash instead of nested arrays:

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


<%= select_tag "foo[bar]", 
grouped_options_for_select(grouped_options, 'Denmark') %>

Here, there is also a selected option ('Denmark')