Rails 验证:将输入限制为特定值 [英] Rails Validation: Limit input to specific values

问题描述

我正在寻找Rails 方式"来编写将可接受的输入值限制为预定列表的验证.

I'm looking for "the Rails Way" to write a validation that limits acceptable input values to a predetermined list.

就我而言，我只想接受值-5"、-2"、+2"、+5"和 nil.但是，我认为这最好作为一个一般性问题:您如何在 Rails 模型中预定义可接受的条目值列表?

In my case, I want to only accept the values "-5", "-2", "+2", "+5", and nil. However, I think this is best as a general question: how do you predefine a list of acceptable entry values in a Rails model?

谢谢！

推荐答案

validates_inclusion_of 应该可以工作.例如:

validates_inclusion_of should work. For example:

  validates_inclusion_of :attr, :in => [-5, -2, 2, 5], :allow_nil => true

这篇关于Rails 验证:将输入限制为特定值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！