select_tag with options_for_select

An example of using options_for_select with select_tag

<%=select_tag 'category_id', options_for_select(Category.all.collect{ |u| [u.name, u.id] })
 %>

This would generate something like:

<select id="user_id" name="user_id">
  <option value="1">Brad</option>
  <option value="2">Angie</option>
  <option value="3">Jenny</option>
</select>