如何验证提交的 ActiveRecord 的单个属性而不是其所有属性？

发布于 2024-10-24 22:32:30 字数 409 浏览 1 评论 0原文

我正在使用 Ruby on Rails 3，我想验证提交的 ActiveRecord 的单个属性而不是其所有属性。

例如，在我的模型中：

validates :firstname, :presence => true, ...
validates :lastname,  :presence => true, ...

我想分别对 :firstname 和 :lastname 运行验证。 可能吗？如果是这样，我该怎么做？

PS：我知道出于验证目的，有“validates_presence_of”、“validates_confirmation_of”等方法，...，但我只想使用上面的代码。

原文

I am using Ruby on Rails 3 and I would like to validate a single attribute for a submitting ActiveRecord instead of all its attributes.

For example, in my model I have:

validates :firstname, :presence => true, ...
validates :lastname,  :presence => true, ...

I would like to run validation on the :firstname and on the :lastname separately. Is it possible? If so, how can I make that?

P.S.: I know that for validation purposes there are methods like "validates_presence_of", "validates_confirmation_of", ..., but I would like to use only the above code.

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傻比既视感 2024-10-31 22:32:30

您可以在模型上设置虚拟属性，然后根据该属性进行条件验证。

您可以在 http://railscasts.com/episodes/41-conditional-validations 找到有关此内容的截屏视频

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暮倦 2024-10-31 22:32:30

class Model < ActiveRecord::Base  
  def save(*attrs)
    Model.validates :firstname, :presence => true if attrs.empty? || attrs.include?( :firstname )
    Model.validates :lastname,  :presence => true if attrs.empty? || attrs.include?( :lastname )
    ...
    super
  end
end

m = Model.new
m.save
#=> false
m.save(nil) # same as save(false), you can use both of them
#=> true
m = Model.new :firstname => "Putty"
m.save
#=> false
m.save(:firstname, :lastname)
#=> false
m.save(:firstname)
#=> true

class Model < ActiveRecord::Base  
  def save(*attrs)
    Model.validates :firstname, :presence => true if attrs.empty? || attrs.include?( :firstname )
    Model.validates :lastname,  :presence => true if attrs.empty? || attrs.include?( :lastname )
    ...
    super
  end
end

m = Model.new
m.save
#=> false
m.save(nil) # same as save(false), you can use both of them
#=> true
m = Model.new :firstname => "Putty"
m.save
#=> false
m.save(:firstname, :lastname)
#=> false
m.save(:firstname)
#=> true

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