如何验证嵌套模型中的附件？

我有一个设计模型在两个关联（full_image和preview）中有两个Paperclip附件。我希望只有在full_image和preview都具有有效文件但似乎无法使其工作的情况下才能保存设计。现在，这是我期望的工作，但它并不仅仅在我提交表单时不会验证附件。如何验证嵌套模型中的附件？

class Design < ActiveRecord::Base 

    has_one :full_image, :as => :assetable, :class_name => "FullImage", :dependent => :destroy 
    has_one :preview , :as => :assetable, :class_name => "Preview" , :dependent => :destroy 

    accepts_nested_attributes_for :full_image, :preview 
    validates_associated :preview, :full_image 

end 

class Asset < ActiveRecord::Base 
    belongs_to :assetable, :polymorphic => true 
    delegate :url, :to => :attachment 
end 

class FullImage < Asset 
    has_attached_file :attachment 
    validates_attachment_presence :attachment 
end 

class Preview < Asset 
    has_attached_file :attachment 
    validates_attachment_presence :attachment 
end

有人可以请建议我应该做什么？

来源

2013-03-19 Roman

这里里面是怎么得到它的工作

class Design < ActiveRecord::Base 

    has_one :full_image, :as => :assetable, :class_name => "FullImage", :dependent => :destroy 
    has_one :preview , :as => :assetable, :class_name => "Preview" , :dependent => :destroy 

    accepts_nested_attributes_for :full_image, :preview 

    validates_presence_of :preview 
    validates_presence_of :full_image 

end 

class Asset < ActiveRecord::Base 
    belongs_to :assetable, :polymorphic => true 
    delegate :url, :to => :attachment 
end 

class FullImage < Asset 
    has_attached_file :attachment 
end 

class Preview < Asset 
    has_attached_file :attachment 
end

来源

2013-03-19 09:22:37 Roman

尝试：验证：附件：存在=>真关联的模型，而不是validates_attachment_presence

来源

2013-03-19 06:31:30 Mastfish

如何验证嵌套模型中的附件？

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