When creating, updating, or otherwise changing stacks in AWS CloudFormation, one must supply information such as the stack name, a list of parameters, and so on. This gem helps validate the information against the requirements of the corresponding API actions

Bare-bones minimum slugs. No validations or versioning.

validate if a string is right email format

This acts_as extension implements a system label and a friendly label on a class and centralizes the logic for performing validations and accessing items by system label.

Rails' default update_attributes behavior is that when any validation fails, none of the data gets saved. However, in some instances this is not the most ideal behavior. If you import partial data which users then have the task of completing, not saving partially completed forms can create a real...

Dynamic uniqueness validator to validation two fields before save in db.

Parameter validation extension for Sinatra

Adds an abstract EachValidator superclass that you can use to create localizable validations.

Mobile MSISDN detection & validation. Only useful whenever your'e a Mobile Operator 3rd Party and receive MSISDN headers.

Small and extensible data validation toolkit

Hashie2 + ActiveModel 3, offering declared properties, validations, JSON serialization/deserialization

Validate presence/absence of resource creation/update and relationship update payloads, as well as types related resources

Validates polish identification numbers NIP, PESEL, REGON. Can be used in any ruby script or integrated with Rails validation

Allows Kumi schemas to be written as plain text with syntax validation and editor integration.

This gem is very fast C++ code for calculating AUCs on results of cross-validation. It is specific to the crossval database schema, which has not been released yet. Chances are you will not find this very useful unless you are the author. It is in gem form to ensure that each lab machine can c...

A composable application toolkit, providing data entities and collections, transforms, contract-based validations and pre-built operations. Architecture agnostic for easy integration with other toolkits or frameworks.

Hat-Trick brings together jQuery, validation_group, and Ajax to make multi-step forms awesome. It tries to insulate you from this complexity by providing a simple yet powerful DSL for defining the steps of your form and their behavior.

Cloudformation tasks for apply(create/update), delete, recreate on stack along with validations on templates

Ruby gem that mimics AWS SQS Extended Client with features like S3 offloading, compression, cleanup, validation, and logging.

A library that sucks... validation errors into an accumulator.