我有一个简单的表格，我用它来过滤一个学生表。通过使用f.collection_check_boxes，我得到了一个丑陋的复选框段落。我想有一个下拉列表，让我可以一次选择多个复选框。
我现在的代码是

.card-header.d-flex.align-items-center
    %span Listing Students

    = link_to 'New Student', new_student_path, class: 'btn btn-outline-secondary ms-auto'
    %button.btn.btn-outline-secondary.dropdown-toggle.mr-2#filter-button{"type": "button", "data-bs-toggle": "dropdown", "aria-expanded": "false"}
      Filter
    %ul.dropdown-menu{"aria-labelledby": "filter-button"}
      %li
        = simple_form_for :filter, url: filter_students_path, method: :post do |f|
          = f.input :givenname
          %div
            = f.collection_check_boxes(:course_ids, Course.all, :id, :course_code)
            = button_tag 'SELECT', type: 'button', class: 'select_btn'
            %br
          %div
            = f.collection_select(:location_ids, Location.all, :id, :location_name, multiple :true)
            = button_tag 'SELECT', type: 'button', class: 'select_btn'
            %br
          %div
            = f.collection_check_boxes(:sector_ids, Sector.all, :id, :sector_name)
            = button_tag 'SELECT', type: 'button', class: 'select_btn'
            %br
          = f.submit 'Search'
          = link_to 'Reset', students_path

它产生了一个按钮，当点击有一个下拉菜单的多组选项，以过滤由即时通讯测试不同的方法，现在只有一个选项，所以collection_select结果在一个列表，允许我检查多个当我点击+ shift键，但我希望这些是一个下拉的复选框，而不是一个列表。