How to validate EAN barcodes in a Rails model?

Use the EanValidator by adding `validates :barcode, ean: true` to your model. It supports both EAN-8 and EAN-13 formats, simplifying validation for inventory or e-commerce apps without custom code.

Validates gem vs Rails built-in validators: which is better?

Validates extends Rails' built-in validators with niche formats like URLs and EANs, making it ideal for specific use cases. However, for standard validations, Rails core is sufficient to avoid extra dependencies.

How to filter associated records when validating length in Rails?

Use AssociationLengthValidator with the :select option, such as `select: ->(employee) { employee.name.in? ["Mike", "John"] }`, to validate only a subset of associations, as shown in the Company model example.

Does validates gem support IPv6 address validation?

The IpValidator handles IP address formats, but the README doesn't specify IPv6 support explicitly; check the source code or tests for compatibility, as it might be limited to common formats.

Is the validates gem maintained for latest Rails versions?

Check the GitHub repository for recent commits and issues; the README shows a version badge and build status, but maintenance might be sporadic, so verify compatibility with your Rails version.

How to add custom error messages with validates gem?

Use Rails' standard i18n or the :message option in validation calls, but the gem doesn't provide pre-translated messages, requiring manual setup for multilingual applications based on Rails conventions.

Validates — Custom Rails Validators Collection

What is Validates?

Validates is a Ruby gem that provides a collection of custom validators for Rails applications, extending ActiveRecord and ActiveModel validation capabilities. It simplifies data validation by offering ready-to-use validators for common use cases like email addresses, URLs, EAN codes, and more.

Target Audience

Ruby on Rails developers who need to implement data validation beyond Rails' built-in validators, particularly for specific formats like EAN barcodes, URLs, slugs, or IP addresses.

Value Proposition

Developers choose Validates for its seamless integration with Rails conventions, declarative syntax, and a curated set of validators that handle niche formats without requiring custom implementation.

Overview

Key Features

EmailValidator — Validates email address format.
UrlValidator — Validates URL format.
EanValidator — Validates EAN-8 and EAN-13 barcode numbers.
AssociationLengthValidator — Validates the length of associations with filtering options.
SlugValidator — Validates URL-friendly slug strings.
ColorValidator — Validates color formats.
IpValidator — Validates IP address formats.
MoneyValidator — Validates monetary values.
AbsolutePathValidator — Validates absolute file paths.
UriComponentValidator — Validates URI components based on RFC standards.

Philosophy

Validates follows Rails conventions, providing simple, declarative validators that integrate seamlessly with ActiveRecord models, promoting clean and maintainable code.

Validates

What is Validates?

Overview

Key Features

Philosophy

Related Projects

Found a gem we're missing?

Use Cases

Best For

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions