如何验证数值的小数位数? [英] how to validate the number of decimal for a numeric value?

问题描述

我在模型中进行了验证，如下所示:

I have my validation in the modle like follows:

validates_numericality_of :shoe_size, :message=>'Please input a number'

但这还不够，因为用户可以输入一些值，如42.22222222121212121212..."，这是不期望的.那么，如何验证输入只有两位小数，如 42.22

But this is not enough because user can input some value like "42.22222222121212121212..." which is not expected. So, how to validate the input to have only two decimals like 42.22

推荐答案

你可以试试这个:

validates_format_of :shoe_size, :with => /^\d+\.*\d{0,2}$/

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