Rails plugin that provides a validates_ip_format_of method to ActiveRecord models. IPs are validated by regexp. IP validation. Validate IP.

Validate specific value for Rails

Add to Rails the possibility to validate the quantity of an associate model

validates_schema was developed by: markbates

Makes boolean validations a little cleaner.

Library for validating unchangeable attributes.

Validate uniqueness of multiple newly associated records

Rails plugin that provides a validates_uri_format_of method to ActiveRecord models. URLs are validated by several options.

Provides validates_xml method allowing to validate xml correctness of ActiveRecord attributes.

Adds basic reflection support to ActiveRecord validations

ActiveModel Interface for validation_reflection

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.

The beginning of a validation library

Adds valid transition validations to AR.

Value objects for your active models

values_for makes your ActiveRecord-backed class work with an enumerable type. Instead of existing ActiveRecord plugins such as enum_fu, which store the enumerable attribute as an integer, values_for stores the content of the enumerable attribute in a varchar column of the database. The field will automatically validate using validates_inclusion_of and accepts all the same options. values_for will also optionally create named scopes, predicate methods, and constants defining the possible values for enumerable types on your model. By default, however, it avoids polluting your model with things you may not need unless these features are specifically requested.

Gem for calculating product sum with vat, product sum without vat and product sum of vat.

Seperate databases for every branch in your development environment

Wrapper for Velib api, for no-fuss cycling