複雜的條件軌3 ActiveRecord的查詢

Question

下面是Package.rb

當前代碼

def self.available 
    joins(:deals).where(:available_for_purchase => true).uniq 
end 

現在我想包的詳細條件，這裏的條件::

:duration != nil 
:expiration_date > Date.today 

• 兩個：持續時間和：截止日期不應該存在，我的意思是一個 它們必須爲空，

• 兩者都不能爲空。

• 返回包滿足上述

感謝所有條件提前。

Answer 1

奧凱終於拿到了查詢，這裏是結果

def available 
    joins(:deals).where("available_for_purchase=? 
      AND(
       (expiration_date IS NOT NULL AND expiration_date > ? AND duration IS NULL) 
       OR (duration IS NOT NULL AND expiration_date IS NULL) 
     ) ",true,Date.today).group(:id) 
end 

Answer 2

我希望我理解這個問題的權利，你可以試試這個：

def self.available 
    joins(:deals).where("available_for_purchase = ? AND duration NOT ? AND expiration_date > ?", 
     true, 
     nil, 
     Date.today 
).uniq 
end