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1. 确定是否积极 反对:
原标题:Determine if ActiveRecord Object is New

如何核对<代码> 主动查询 物体是新的,还是已经存在?

最佳回答

活性核物体生命周期:

1. <>新纪录

item = Item.new
item.new_record? #=> true

2.persisted

item.save
item.persisted? #=> true

3.changed

item.name = "other"
item.changed? #=> true

4.destroyed

item.destroy
item.destroyed? #=> true
问题回答

#new_record? 只是:

object.new_record?




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