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

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.

Library for validating urls in Rails.

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

Serializable and validatable value objects for ActiveRecord

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....

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