最佳实践

Question

这里是我的情况：我有两个ActiveRecord的模式：

class SomeAction < ActiveRecord::Base 
    has_one :moderation 
end 

class Moderation < ActiveRecord::Base 
    belongs_to :some_action 
end 

我想适度更新SomeAction的状态属性为“完成”时，我救适度与它相关。如果由于某种原因SomeAction的更新不成功，我希望适度不保存。我知道我应该在before_save回调中这样做，但是返回false（在意识到SomeAction记录不可更新后）将不会ROLLBACK一切。任何IDE

Answer 1

你想用：自动保存，它会自动验证FO ryou关联的模型。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

确保您的表支持的交易（即MySQL的InnoDB的），然后执行以下操作：

class Moderation < ActiveRecord::Base 
    belongs_to :some_action 

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

end