如何确定我的has_many的大小至少为2? [英] How can I make sure my has_many will have a size of at least 2?

问题描述

A has_many B

validates :b, ? # 

我怎样才能准确地确定我至少有2 B?

How exactly I could check that I have at least 2 B?

推荐答案

Rails 3?试试:

Rails 3? Try:

validates :b, :length => { :minimum => 2 }

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