軌HAS_MANY範圍

Question

1. AppScreenshot

   class AppScreenshot < ActiveRecord::Base 
       include Cacheable 
       belongs_to :app 
   
       model_cache do 
       with_key 
       end 
   
       scope :available , where(["state > ? and is_icon = ? ",0,0]) 
   
   end 
   

2. 應用：

   class App < ActiveRecord::Base 
       include Cacheable 
       #acts_as_cached :ttl => 30.minutes 
   
       has_many :apk_files 
   
       has_many :app_screenshots.available 
   
   end 
   

爲什麼has_many :app_screenshots.available？

Answer 1

：app_screenshots只是一個Ruby符號，所以你不能像這樣調用它的方法。

我認爲像has_many :app_screenshots, :conditions => 'state > 0 and is_icon = 0'

應該在你的情況下工作。

Answer 2

如果您執行1.AppScreenshot和2.App :,它會拋出錯誤信息，因爲您不能這樣調用。