Rails在模塊中緩存Time.zone.now？

Question

我有一個奇怪的錯誤，其中生產範圍不反映當前時間。

module TimeFilter 
    # Provides scopes to filter results based on time. 
    def self.included(base) 
    base.extend(ClassMethods) 
    base.class_eval do 
     scope :today, where(end_time: Time.zone.now.midnight..Time.zone.now) 
     scope :this_week, where(end_time: Time.zone.now.beginning_of_week..Time.zone.now) 
     scope :this_month, where(end_time: Time.zone.now.beginning_of_month..Time.zone.now) 
     scope :older_than_this_month, where("end_time < ?", Time.zone.now.beginning_of_month) 
     scope :last_month, where(end_time: Time.zone.now.beginning_of_month..Time.zone.now.beginning_of_month - 1.month) 
    end 
    end 
end 

Time.zone.now似乎與rails控制檯中的相同。

如果我提出從庫中範圍到我的模型它的工作原理沒有問題。難道我做錯了什麼？

Answer 1

是的，你的範圍正在評估一次，在class_eval。要解決此問題，使用lambda你的範圍，就像這樣：

scope :today, lambda {where(end_time: Time.zone.now.midnight..Time.zone.now)} 
    scope :this_week, lambda {where(end_time: Time.zone.now.beginning_of_week..Time.zone.now)} 
    scope :this_month, lambda {where(end_time: Time.zone.now.beginning_of_month..Time.zone.now)} 
    scope :older_than_this_month, lambda {where("end_time < ?", Time.zone.now.beginning_of_month)} 
    scope :last_month, lambda {where(end_time: Time.zone.now.beginning_of_month..Time.zone.now.beginning_of_month - 1.month)} 

這將導致該次評估時的實際範圍被調用，而不是當EVAL被調用。