Adds before_validation callback, which applies necessary function to attributes. There are some derivatives: squish_before_validation_for, downcase_before_validation_for, upcase_before_validation_for.

SchemaValidations extends ActiveRecord to automatically create validations by inspecting the database schema. This makes your models more DRY as you no longer need to duplicate NOT NULL, unique, numeric and varchar constraints on the model level.

Client Side Validations for Rails 2.x and 3.x

A Validation framework for creating validation profiles, allowing for the separation & reuse of validation logic from the object being validated.

"sinatra-validation is a gem to define parameter validation with dry-validation"

HTML Validation lets you validate html locally. Lets you build html validation into your test suite, but break the rules if you must.

Enum Attributes Validation provides validation functionality for enum attributes in models.

isbn_validation adds an isbn validation routine to active record models.

CouchRest Model provides aditional features to the standard CouchRest Document class such as properties, view designs, associations, callbacks, typecasting and validations.

OpenAPI based request validation, response validation, contract-testing and coverage

Define, enforce, and handle violations of validation rules for Chef node attributes. This gem provides the validation engine, and can be used outside of a convergence run; a cookbook (attribute-validator) is available to perform validation during a chef run, at compile or converge time.

This gem allows similar ActiveRecord validates_* commands to be grouped together in blocks and pruned of repeated parameters. How often have you had a block of validation commands in an ActiveRecord object that are repeated, especially :id or :unless options? Does this look familiar? validat...

An implementation of the Command Pattern for Ruby with ActiveModel::Validations inspired by the interactor gem. Rich support for attributes, callbacks, and validations, and thread safe performance methods.

Writing specs for complex validations is annoying. AcceptValuesFor makes iteasy to test your validations with real world values, asserting which valuesshould be accepted by your model and which should not.

A ruby gem for validating credit card numbers

Wechat Server Validation Library handles the validation requests from the Wechat servers. 微信服务器验证库用于处理微信服务器发出的验证请求。

This gem allows you to express the validations in your models as JSON objects, so that you can implement them as client side validations.

sequel-more-validations is a Sequel model plugin that provides common helplful validations.

CareBert analyzes the current items of your database and performs differing validation and integrity tests. Currently it supports following checks: \n - Table Integrity => check each single model-instance of all available tables can be loaded \n - Model Validation => triggers the validation...

After each migration it generates a file with some validations. Each active record should include this file and can uns generated validations.