A wrapper around Ruby's OptionParser with validation, conflict groups, and one-of constraints

Uses dry-validation

A mountable Rails engine providing a complete data import workflow: upload/configure, preview with validation, and import. Supports CSV, JSON, XLSX, and API sources with a simple DSL for defining import targets.

A simple library for external validations of POROs

A small dry-rb-based base service/interactor with optional contract validation.

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

Validates a specific attribute on ActiveModel, ActiveRecord

Use the familiar ActiveModel::Errors pattern for controller validations

ReCaptcha implements view helpers to generate ReCaptcha code, with the noscript counterpart, required methods that interface with the HTTP API for captcha verification, a DSL to generate a before_filter and the code to implement AJAX captcha validation.

Providing special validation error building for has_many collection in Rails.

Manage markup close to home... right in the model! Caching, validation, etc

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.

Clean Language Validation

Some reusable ActiveModel validations, including greater_than, boolean_presence, and at_least_one_present

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...

Template-based payload transformation between tasks with multiple engines, schema validation, and composition

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

Cave Forms encapsulate validation logic into an object with that single responsibility