从表中的选择单元格中获取值

Question

我制作一个select_tag来选择值：

#index
 <%= form_tag com_port_setting_write_path do %>
            <%= select_tag "dropdown_cases[]", options_for_select([ ["6 Bottles", 1], ["12 Bottles", 2], ["18 Bottles", 3], ["24 Bottles", 4], ["30 Bottles", 5], ["36 Bottles", 6], ["42 Bottles", 7]]) %>
            <%= submit_tag "Setting",:class => "btn btn-primary offset4" %>
            <%end%>
<%end%>


#controller
def index

end

def com_port_setting_write
    params["dropdown_cases"].each do |cases|
        @this_is_the_dropdown_value = cases.to_i
        puts @this_is_the_dropdown_value
    end
    render :com_port_setting
end

它工作正常但我想更改它以从表格中的选择单元格获取值，我该怎么做

编辑：我想创建一个表并从select cell获取值，我不知道该怎么做