Currency Validation in Ruby on Rails

Published October 9, 2013

Last updated January 3, 2017

This brief post will show you how to validate currency in your Ruby on Rails app.

If you ever need to validate currency in your Ruby on Rails app, simply add the following line of code to the model of your choice.

app/models/yourmodel.rb:


validates :price, :presence => true,
            :numericality => true,
            :format => { :with => /^\d{1,4}(\.\d{0,2})?$/ }

This will allow values of up to $9999.99 with an optional decimal place (if the decimal is present, no more than 2 digits must follow.) Tweak as needed.

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Guest User

Posted about 1 year ago

The regular expression matches this value

12.

It should be changed to /^{\d{1,4}(.\d{1,2})?$/}

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Disqus User

Posted almost 4 years ago

For little suggestion, now rails will warn you if you using ^ and $. It will better using:format => { :with => /\A\d{1,4}(.\d{0,2})?\z/ } instead.

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Currency Validation in Ruby on Rails

Currency Validation in Ruby on Rails

app/models/yourmodel.rb:

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