validate-response is a gem for bringing error messages from one or more ActiveRecord objects to the unified structure & highlight validation errors in forms (ajax supported).

ActiveRecord model validation against stopforumspam.com (Rails 3)

Brazilian zipcode validations for ActiveRecord, integrated with correios-cep gem.

ActiveRecord validations for danish CVR numbers

Some description for validates-gem

Use those validators for Australian numbers as ABN, TFN, ...

SWIFT validator for ActiveRecord attributes.

Validates TeamViewer ID for ActiveRecord attributes.

Validate if an association has unique values on a specific attribute.

A notifier for form validation errors.

Find and report ActiveRecord validation errors.

A extension activemodel's validations to validation step by step.

Reuse your Rails model validations on the client-side.

Tracks each validation error, providing an aggregate to identify UI issues

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

Rails 3 generator plugin that generates validator's skeleton files.

Check the contents of your database by validating the models.

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...

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...

Ensure that your routes don't conflict. Main use cases are for dynamic routes that could conflict with resourcefully generated routes.