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铁路AR验证了与多形态关系有关的特性。
原标题:Rails AR validates_uniqueness_of against polymorphic relationship

是否可确认儿童模式的独特性,使之与多吗?

例如,我有一个称为<条码>的模型,该模型属于<条码>可登陆:

class Field < ActiveRecord::Base
  belongs_to :fieldable, :polymorphic => :true
  validates_uniqueness_of :name, :scope => :fieldable_id
end

我还有其他几个模式(工资、项目),有许多领域。 因此,我想证实外地名称相对于母体模式的独特性,但问题是,有时某个页和某个项目拥有相同的识别号码,从而导致验证失败。

我只是这样做,还是有更好的办法这样做?

最佳回答

扩大范围以包括可操作的类型:

class Field < ActiveRecord::Base
  belongs_to :fieldable, :polymorphic => :true
  validates_uniqueness_of :name, :scope => [:fieldable_id, :fieldable_type]
end
问题回答

您还可以发出信息,以推翻缺省信息,或利用范围添加确认:

class Field < ActiveRecord::Base
  belongs_to :fieldable, :polymorphic => :true
  validates_uniqueness_of :fieldable_id, :scope => [:fieldable_id, :fieldable_type], :message =>  cannot be duplicated 
end

作为奖金,如果你去掉你的话,进入:

  activerecord:
    attributes:
     field:
       fieldable_id:  Field 

你将用你在此具体指出的错误取代铁路造成的缺省主题。 因此,不能说:<条码> 已采用 或这样说:

 Field cannot be duplicated




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