最佳實踐

Question

這裏是我的情況：我有兩個ActiveRecord的模式：

class SomeAction < ActiveRecord::Base 
    has_one :moderation 
end 

class Moderation < ActiveRecord::Base 
    belongs_to :some_action 
end 

我想適度更新SomeAction的狀態屬性爲「完成」時，我救適度與它相關。如果由於某種原因SomeAction的更新不成功，我希望適度不保存。我知道我應該在before_save回調中這樣做，但是返回false（在意識到SomeAction記錄不可更新後）將不會ROLLBACK一切。任何IDE

Answer 1

你想用：自動保存，它會自動驗證FO ryou關聯的模型。在activerecord/lib/active_record/autosave_association.rb

class SomeAction < ActiveRecord::Base 
    has_one :moderation 
end 

class Moderation < ActiveRecord::Base 
    belongs_to :some_action, :autosave => true 

    before_validation do |moderation| 
    moderation.some_action.complete # Changes state 
    end 

    # autosave kicks in and validates the associated record 
    # If validation for some_action fails, the error messages will be pulled up in Moderation 
end 

更多信息，或Rails documentation

Answer 2

確保您的表支持的交易（即MySQL的InnoDB的），然後執行以下操作：

class Moderation < ActiveRecord::Base 
    belongs_to :some_action 

    def do_save 
    transaction do 
     some_action.status = 'complete' 
     some_action.save! 
     save! 
    end 
    end 

end