Understanding Ruby on Rails ActiveRecord Validations

Hi, My name is Andy Leverenz and I work as a Product Designer at Dribbble. For fun, I design, code, and write. Check out my blog called Web-Crunch https://web-crunch.com where I publish design and development tutorials with the occasional vlog.

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Data is a great thing but the wrong data can be very very bad. Luckily, if you're a Ruby on Rails programmer you have a nice API of ActiveRecord validation helpers at your disposal.

This guide is an exploration of common and not so common ActiveRecord validations in a given Ruby on Rails application. Use it to help keep your databases happy!

Why use validations?

To ensure only valid data is saved to your database. On top of clientside validation, model-level validations provide an extra layer of security for any and all form fields within a Ruby on Rails application.

When does validation actually occur?

Straight from the ruby on rails documentation:

There are two kinds of Active Record objects: those that correspond to a row inside your database and those that do not. When you create a fresh object, for example using the new method, that object does not belong to the database yet. Once you call save upon that object it will be saved into the appropriate database table. Active Record uses the new_record? instance method to determine whether an object is already in the database or not.

Continue reading this on my blog: https://web-crunch.com/understanding-activerecord-validations-ruby-on-rails

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