If you've gone through the trouble of linking your schema with proper foreign keys, defining associations in ActiveRecord feels like double work. ActiveSchema discovers the associations and validations that can be derived from the database schema.

Validate commonly used attributes easily with ActiveValidation.

Create Rails active record style validation in your non-Rails app

Postal code validation.

CouchSurfer provides an ORM for CouchDB, as well as supporting association and validation declarations.

A project that is an attempt to rehabilitate and generalize a data ingestion/importation service originally built for a retail, e-commerce platform. It aims to provide a robust solution for mapping intermediate representations of database records (CSV at the moment) to persisted data. The process...

Allows easy generation of the allhomes.com.au XML feed by passing in property attributes. Also allows validation of XML

Amp's required plugin, providing core functionality (such as repository detection and amp-specific command validations) to all other plugins.

Avoid sending plain text messages to API consumers by sending them more detailed information about validation errors.

Rails 3 assocation validation for id fields

Serialize models with validation errors to json-api errors.

Give you the ability to search the Australia Post Web site with either Suburb or Postcode, and return an array of Locations. Also add's validation methods to ActiveRecord Objects to allow you to validate that A Postcode + State + Suburb is correct

Enkrip will encrypt & decrypt Active Record attributes seamlessly with Message Encryptor. By default compatible with Active model validation

HTTP request signing and validation library with support for header signing and multiple backends.

A component to auto generate seed data with ActiveRecord using a set of predefined or custom rules respecting models validations

validation error renderer for ajax request

Create backbone twitter bootstrap form views easily using helpers. Handle and display validation failures from rails.

Use the backbone-forms library https://github.com/powmedia/backbone-forms: a "Form framework for BackboneJS with nested forms, editable lists and validation"

masterdata mostly used for validations of countrycodes, country, states, countrydailcode, contactnumbers, pincodes and emailaddress which can be helpful for data preprocessing. Along with this something special is that gaining the information from country/countrycodes/countrydailcodes.Lets look ...

Bank account tools for dealing with IBANs/BICs: information, validation and formatting.