Phone number parsing, validation and formatting.

Useful to make forms and validations. It uses MaxMind database.

AutoStripAttributes helps to remove unnecessary whitespaces from ActiveRecord or ActiveModel attributes. It's good for removing accidental spaces from user inputs. It works by adding a before_validation hook to the record. It has option to set empty strings to nil or to remove extra spaces inside...

Validations mixin for Ruby objects and support for Lotus

Library for performing validations on DM models and pure Ruby object

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.

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

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

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.

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

Rails Validation API provides a powerful for validating request parameters in Rails applications. Features include automatic validator loading based on controller/action names, nested parameter validation, custom error handling, and seamless integration with Rails controllers through concerns. Pe...

"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.

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.

isbn_validation adds an isbn validation routine to active record models.

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.

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