mongoid after_remove回調不工作

Question

這是我的模型：

class Country 
    include Mongoid::Timestamps 
    has_many :cities, after_add: :show_log, after_remove: :show_log 

    def show_log 
    puts "this is log!" 
    end 
end 

控制檯

這裏：

Country.first.cities.create FactoryGirl.attributes_for(:city) 
=> [.....] this is log! 
Country.first.cities.first.destroy 
=> true 

，你在第二個看，沒有什麼是登錄！ mongoid after_remove出了什麼問題？

Answer 1

我認爲你是從數據庫中摧毀城市。您應該從關係中刪除它：

Country.first.cities.destroy(Country.first.cities.first)