It sure would be awesome if ActiveResource actually allowed us to do client-side validation of our ActiveResource objects like their documentation promises: http://apidock.com/rails/ActiveResource/Base

Add a validation headers filter to your rails controller.

Validate an email address using RFC 822 pattern match regex regular expressions

Basic document validation

The Wechat Validator engine handles the Wechat server validation requests. 微信验证器引擎处理微信服务器的验证请求。

Tiny implementation of the command pattern, including input validation, using Scrivener.

ActiveRecord Tableless provides a simple mixin for creating models that are not bound to the database. This approach is mostly useful for capitalizing on the features ActiveRecord::Validation

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...

A wrapper around Ruby's OptionParser with validation, conflict groups, and one-of constraints