Shows what a field expects before validation fails — complementary to ActiveModel errors.

Use reflection to spec ActiveModel validations

Helper to customize the validation messages in Hanami application views.

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

log active model validation errors to get better insights in the usability of your forms

If you need a way to easily skip validations on some attributes and only in certain cases, this gem will allow you to do it in a clean and elegant way.

validations-skipper is a gem that enables objects to skip specified validations with ease. It can be applied to ActiveRecord::Base classes.

Checks whether an ActiveModel Validator is attached to an attribute of a Model and with which options

extension for active_record

Validação de inscrição estadual dos 26 estados federativos

Allow validate uniqueness across multiple column

An implementation of several error checking algorithms,including Luhn and Damm.

contextual validations for controllers and wanna learn to do other stuff good too

ActiveModel validation for credit card number.

As your Rails projects evolve and grow, your model validations tend to change as well. An unfortunate side effect of this evolution is that your table- backed ActiveRecord::Base descendants end up with rows that instantiate invalid model instances. ValidData generates a report for your Rails appl...

Your favourite validations with Ruby

Validate ISO country and Code

Goes through all your Rails ActiveRecord objects and check if they are all still pass your model validations. You may have added new validations to your model since creating your object, or ran update_column in your console to solve a production issue. Find issues in your db before others do. Ins...

Ruby gem to check validity of Estonian ID card or Estonian Passport

valid_syntax checks if a string containing ruby code has any syntax errors. If this is the case, the syntax errors will be stored to be later accessed.