ruby-on-rails - 使用 select_tag 显示多个选定的值？

Question

我有一个数组@name = ["D2", "D3"]，那么如何将其设置select_tag为选定的选项。

我正在尝试这个，但没有显示

<%= select_tag "add", options_for_select(["D1","D2","D3","D4"],{
@name.each do |id| :selected =>"#{id}" } ), {:multiple => true}

Answer 1

那个怎么样 ：

<%= select_tag "add", options_for_select(["D1","D2","D3","D4"],@name), {:multiple => true} %>

Answer 2

你需要这样的东西：

<%= select_tag "add", options_for_select(["D1","D2","D3","D4"], :selected =>["D1","D4"]) , :multiple => true %>

除非你name.id给你一个“D1”，否则你可能想改变你的方法。哪个字段name对应“D1”？