Notes posted by magnemg
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How to include a “Please select…” (default/prompt) in a grouped dropdown list.
The clue here is that you actually specify the prompt on the select element, and not in the option_groups_from_collection_for_select element.
<%= f.select :post_type_id, option_groups_from_collection_for_select(@categories, :post_types, :name, :id, :name), :include_blank => "Please select..." %>
Hope this helps someone.


