grouped_collection_select(method, collection, group_method, group_label_method, option_key_method, option_value_method, options = {}, html_options = {}) public

Wraps ActionView::Helpers::FormOptionsHelper#grouped_collection_select for form builders:

<%= form_for @city do |f| %>
  <%= f.grouped_collection_select :country_id, @continents, :countries, :name, :id, :name %>
  <%= f.submit %>
<% end %>

Please refer to the documentation of the base helper for details.

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