Phone number parsing, validation and formatting.

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...

Introspects your database string field maximum lengths and automatically defines length validations.

A gem that provides credit card validation. It is basically a ruby port of the javascript credit card validator by Thomas Fuchs (madrobby) (http://github.com/madrobby/creditcard_js).

Validations mixin for Ruby objects and support for Hanami

ActiveRecord Tableless Models provides a simple mixin for creating models that are not bound to the database. This approach is useful for taking advantage of the features of ActiveRecord such as validation, relationships, etc.

StripAttributes automatically strips all ActiveRecord model attributes of leading and trailing whitespace before validation. If the attribute is blank, it strips the value to nil.

Client Side Validations for Rails 4

Validations for immutable Ruby objects

Handles application errors and model validations

Contains commands, events, validations for Rails Disco. Commands are used to transport updates from Rails to the domain. Validations are used to validate commands in Rails and the domain. Events are created in the domain and processed in projections. Have a look at the rails...

Validations mixin for Ruby objects and support for Lotus

Simple actions and complex forms with validations, nesting, etc.

DB constraints in migrations similiar to ActiveRecord validations. Core classes

Email address validation using RFC 822 pattern matching regular expressions

Make hash-based object initialization easy! Provides hash_make method that can consider parameter name, type, default value, validation, and requiredd/not, according to the specification provided. Also, by default assigns by default to instance variable of same name as parameter.

Core classes for data validation with contracts approach (using Either + Writer monad combination & ADT for composition)

cucumber-api allows API JSON response validation and verification in BDD style.

Provides validation and additional data about SPDX licenses and identifiers

Rumale::ModelSelection provides model validation techniques, such as k-fold cross-validation, time series cross-validation, and grid search, with Rumale interface.