also_validates

acceptance

Reflect on your Rails validations and generate JavaScript from them

mini-defender

Pragmatic data validation

forminate

Form objects for Rails applications

mechanical

All models in a single table, new attributes without migrations. Works like regular AR model

mutations

Compose your business logic into commands that sanitize and validate input.

strongest_params

html5_validators

A gem/plugin for Rails 3, Rails 4, Rails 5, and Rails 6 that enables client-side validation using...

valid_attribute

Minimalist validation BDD for ActiveModel specs

accept_values_for

Rspec matchers to test ActiveModel validation that follows BDD.

has_face

An Active Model validator that ensures an image contains a face using the face.com API.

validates_constancy

Adds an Active Record validation, ‘validates_constancy_of’, that prevents changes to “constant” a...

with_model

Dynamically build an Active Record model (with table) within a test context

rut_validation

RUT/RUN Chilean validator for Rails models.

rspec-validates_timeliness

Simple RSpec matchers for validates_timeliness

active-matchers

Helpful rspec matchers for testing validations and associations.