This gem will take care of scopes, validations and normalization

Instead of scattering validations, strong parameters, and business rules across controllers and models, changesets give you one clear interface for handling data before it touches the database.

validate-response is a gem for bringing error messages from one or more ActiveRecord objects to the unified structure & highlight validation errors in forms (ajax supported).

Bare-bones minimum slugs. No validations or versioning.

A comprehensive gem that provides RLS-based multi-tenancy for Rails applications using PostgreSQL, including automatic tenant context switching, security validations, and migration helpers.

Gem for validation of email

Rspec model tests only comes with one line: 'pending "add some examples to (or delete) #{__FILE__}"'. This gem seeks to populate the model spec with basic tests like validations, relationships, etc..., and then some.

validate if a string is right email format

Description of SimplePhoneValidation.

This acts_as extension implements a system label and a friendly label on a class and centralizes the logic for performing validations and accessing items by system label.

A macro-style method that will automatically read the database contraints (null requirements, string length, etc) and enforce those at the model level to keep validation more DRY. Provides many options to customize how automatic it is and what columns it affects.

Telephone number validation based on RFC3966

CivilService provides a base class for your service objects. With CivilService, you can use ActiveModel validations to do pre-flight checks before the service runs, and create your own result object classes to capture the results of complex operations.

Dynamic uniqueness validator to validation two fields before save in db.

Parameter validation extension for Sinatra

Call method_contraints! with the param name and constraint to enforce validation on it

A Rails controller concern which makes it easy to encapsulate validation and processing of complex incoming data into command classes.

Having to validate method parameters and/or the result of method is a quite common and repetitive task. Tchae is an attempt to capture this task in a small yet generic reuseable library. Tchae provides validated variants of the standard define_method ruby methods , that will create the same metho...

Validates polish identification numbers NIP, PESEL, REGON. Can be used in any ruby script or integrated with Rails validation

Provides a OneOfManyValidator for Rails validation. This allows you to validate that one of a set of fields should be required, but no particular field itself is required.