紅寶石IF或聲明不起作用

Question

我遇到了簡單的IF語句問題。我曾嘗試過幾件事情，但沒有成功。

<% if item.ITEM.strip != 'OEM-LABELS' || item.ITEM.strip != 'DISCOUNT' || item.ITEM.strip != 'OEM-DVR' %> 

    <% if item.ITEM.strip != 'OEM-LABELS' or item.ITEM.strip != 'DISCOUNT' or item.ITEM.strip != 'OEM-DVR' %> 

Answer 1

如果我是你，我會簡化如下

item = "A" 
["C","B","A"].include?item #=> true 
["C","B","D"].include?item #=> false 


if ["C","B","D"].include?item 
    do something 

或

if !["C","B","D"].include?item 
    do something 

Answer 2

嘿那麼幾件事情（不看更多的代碼的）

1. 爲此邏輯創建一個幫手

   def needs_discounting(item) 
       LOGIC HERE 
   end 
   

在你看來

然後

<% if needs_discounting(item.ITEM) %> 
     STUFF 
    <% end %>