ruby-on-rails - After_save 带参数

Question

这是我的模型代码:

after_create :notify_cards_create
after_destroy :notify_cards_destroy
after_update :notify_cards_update

def notify_cards_update
   WebsocketRails[:home].trigger 'cards', {type: 'update', card: self.as_json({small: true})}
end

def notify_cards_create
    WebsocketRails[:home].trigger 'cards', {type: 'create', card: self.as_json({small: true})}
end

def notify_cards_destroy
    WebsocketRails[:home].trigger 'cards', {type: 'destroy', card: self.as_json({small: true})}
end

如您所见，它包含许多重复项!我怎样才能将这段代码缩短为:

after_create :notify_cards_create,   'create'
after_destroy :notify_cards_destroy, 'destroy'
after_update :notify_cards_update,   'update'

谢谢!

Answer 1

我会这样实现:

after_create ->(obj) { notify_cards('create') }
after_destroy ->(obj) { notify_cards('update') }
after_update ->(obj) { notify_cards('destroy') }

protected 

def notify_cards(event_type)
  WebsocketRails[:home].trigger 'cards', {type: event_type, card: self.as_json({small: true})}
end

lambda 的 obj 参数不是强制性的，但如果您想访问正在创建/更新/删除的对象，则可以使用它