Active Record Validations — Ruby on Rails Guides
This guide teaches you how to validate Active Record objects before saving them to the database using Active Record's validations feature. After reading this guide, you will know: How to use the built-in Active Record validations and options. How to check the validity of objects. How to create conditional and strict validations. How to create your own custom validation methods. How to work with th
Rails on Rack — Ruby on Rails Guides
This guide covers Rails integration with Rack and interfacing with other Rack components. After reading this guide, you will know: How to use Rack Middlewares in your Rails applications. Action Pack's internal Middleware stack. How to define a custom Middleware stack. This guide assumes a working knowledge of Rack protocol and Rack concepts such as middlewares, URL maps, and Rack::Builder. 1 Intro
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