Validations

Lesson in the Ruby on Rails Roadmap · Stage 7: Active Record

Last updated 14 September 2026

What is Validations?

Validations are rules that you define for your models to ensure that only valid data is saved into your database. They help maintain data integrity by checking if attributes meet specific criteria, such as presence, format, uniqueness, or custom conditions, before a record is created or updated. If a validation fails, the record will not be saved, and an error message will be added to the object's errors collection.

Study this in the interactive course See the whole Ruby on Rails roadmap

Free resources to learn Validations

Official docsActive Record Validations
ArticleRuby on Rails - Validation
ArticleA Deep Dive into Active Record Validations
VideoActive Record Validations For Beginners | Ruby On Rails 7 Tutorial
VideoUnderstanding Ruby on Rails ActiveRecord Validations

Validations: common questions

Can I learn Validations in Hindi?

This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain Validations in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.

Is this Validations tutorial for beginners?

It is lesson 48 of 98 in the free Ruby on Rails roadmap, in stage 7, Active Record. If you are new to Ruby on Rails, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.