ruby-on-rails - Rails - 回形针在不应该的时候验证附件大小？

Question

我有一个使用 Paperclip 的 Rails 模型，如下所示:

  has_attached_file :image, :styles => { :normal => ['857x392#', :png] },
                    :url => '/assets/pages/:id/:basename.:extension',
                    :path => ':rails_root/public/assets/pages/:id/:basename.:extension'

  validates_attachment_size :image, :less_than => 2.megabytes

在没有要上传的附件的情况下尝试创建此模型的记录时，返回验证错误:

There were problems with the following fields:

* Image file size file size must be between 0 and 2097152 bytes.

我尝试在模型中的验证语句之后同时传递 :allow_blank => true 和 :allow_nil => true，但均无效。

如何让 :image 参数为空？

Answer 1

validates_attachment_size :image, :in => 0.megabytes..2.megabytes

现在工作