I used <% = collection_select: category,: sector_id, @ Sectors,: id,: name, {: prompt => "All",: selected => @ sector}, {: id => 'sector_admin_select'}%>
It worked perfectly, but because I don't need to use the model category, I thought it was more suitable to use:
<% = select_tag: sector_admin_select, options_from_collection_for_select (@ Sectors,: id,: name, @ sector)%>
this also works perfectly, and perhaps for the reason mentioned above it is more suitable for this purpose, only that I would get a prompt that I understand that the select_tag is not possible. I am forced to use collection_select to have a prompt option?