使用select_tag显示多个选定的值？

Question

我有一个数组@name = ["D2", "D3"]，因此如何在select_tag中将其设置为选定的选项。

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

那是怎么回事：

<%= 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 %>

除非您name.id给出“D1”，否则您可能想要改变您的方法。 name中的哪个字段对应“D1”？