用select_tag顯示多個選定的值？

Question

我有一個陣列@name = ["D2", "D3"]，所以如何將其設置爲select_tag作爲選定的選項。

我對這個很努力，但沒有顯示該

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

Answer 1

你需要的東西是這樣的：

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

除非你name.id給你一個「D1」，你可能想改變你的做法。 name中的哪個字段對應「D1」？

Answer 2

什麼有關：

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