ruby-on-rails - 刷新后如何保留多个 select_tag 值？

Question

刷新后如何保留多个 select_tag 的选定值？

<%= select_tag(:cars, options_for_select( [['bmw', 50000], ['audi', 55000], ['fiat', 20000], 0    ), :multiple => true,  :title=> "All Makes", :class => "selectpicker input-small" )  %>

Answer 1

您可以将选定值列表作为第二个选项传递给options_for_select：

<%= select_tag(:cars,
               options_for_select([['bmw', 50000], 
                                   ['audi', 55000],
                                   ['fiat', 20000]],
                                  [55000, 50000]), 
               :multiple => true,  :title=> "All Makes",
               :class => "selectpicker input-small" )  %>

在这种情况下bmw，audi将选择选项。

更多信息请参见此处的 API 参考。