基于正则表达式的Rails自定义验证？

Question

我有以下正则表达式,我在routes.rb中使用/ type-in​​-something-here

# A-Z, a-z, 0-9, _ in the middle but never starting or ending in a _
# At least 5, no more than 500 characters

在路线中,这适用于:

match ':uuid' => 'room#show', :constraints => { :uuid => /[A-Za-z\d]([-\w]{,498}[A-Za-z\d])?/ }

我想将此作为验证,因此不会创建无效记录.所以我在room.rb中添加了以下内容:

validates_format_of :uuid, :with => /[A-Za-z\d]([-\w]{,498}[A-Za-z\d])?/i, :message => "Invalid! Alphanumerics only."

但是这个validates_format_of不起作用,而不是添加错误,它允许记录保存.

有什么想法有什么不对吗？

谢谢

Answer 1

出于验证目的,请记住添加字符串标记的开头和结尾,\A并且\Z:

validates_format_of :uuid, :with => /\A[A-Za-z\d]([-\w]{,498}[A-Za-z\d])?\Z/i

否则,你的正则表达式将很乐意匹配任何至少包含字母或数字的字符串.出于某种原因,Rails隐含地添加了路由中的边界.(可能是因为它将正则表达式嵌入到一个较大的内容中以匹配整个URL,并显式检查/和结束URL.)

Answer 2

用这样的东西

validates :uuid, :format => {:with => /[A-Za-z\d]([-\w]{,498}[A-Za-z\d])?/i},
                 :message => "your message"

欲了解更多检查此

Answer 3

validates :name, format: { with: /\A[a-zA-Z]+\z/,
message: "Only letters are allowed" }