All of the goodness of ActiveModel (validations, callbacks, etc.) along with declarative typed accessors, JSON serialization, and more.

RubyGem for API validation. Here you need to set rules and messages in yml, rest of the things are handle by gem.

This is a gem which allows you to build ActiveRecord objects from an Excel file with validations in your rails application.

Detects issuer from a number, has ActiveModel validations and translations support.

rails-fields gem provides robust field type enforcement for ActiveRecord models in Ruby on Rails applications. It includes utility methods for type validation, logging, and field mappings between GraphQL and ActiveRecord types Custom error classes provide clear diagnostics for field-r...

Manages permalink columns in active record models. Strips special characters and spaces, creates before validation, assures uniqueness. That kind of thing.

Rulix lets you fold complex rulesets onto complex data structures; useful for validation, data sanitization, and mutation.

Input validation DSL and support classes for the Jet Toolkit.

We can validate CPF and CNPJ formats and verifying digits.

A clean, immutable Ruby interface for working with piece identifiers in PNN format. PNN provides a consistent and rule-agnostic notation for representing pieces in abstract strategy board games like chess, shogi, and xiangqi. Features include state modifiers for enhanced/diminished/intermediate p...

Zero-dependency Ruby utilities for: • checksum validation (modulus-11), • component decoding (category, office_code, district_code, sequence), • random valid ID generation, • human-readable category descriptions.

thai_qr_pay is a Ruby gem providing: - ASCII-numeric TLV parsing and encoding - EMVCo CRC-16/IBM-SDLC checksum computation and validation - Generators for PromptPay AnyID, PromptPay Bill Payment, TrueMoney, etc. - Validators for slip-verify and TrueMoney slip verify payloads - BOT barcode → EMVCo...

Use Ruby code to generate JSON schemas with intelligent defaults, validation, and versioning.

This validator uses modern email validation with URI to handle the nuances of checking email throughout your application. Rather than customizing a bunch of random regex that you found on various stack overflow pages, this lets you include a single validator throughout your entire application. It...

Use the familiar ActiveModel::Errors pattern for controller validations

Make hash-based object initialization easy! Provides hash_make method that can consider parameter name, type, default value, validation, and requiredd/not, according to the specification provided. Also, by default assigns by default to instance variable of same name as parameter.

Even Rails can't be trusted not to produce malformed xml sometimes. Add this Rack middleware to the stack while you run your tests and it will monitor the responses you send, infer the appropriate validations based on content type, and raise if they fail.

The Brazilian Tax ID (CPF) validation and formatting, more functions to come

Define required/optional ENV variables with type casting and validation.

Imports delimited text files to Active Record or Datamapper, with validations.