Course 37 - Building Web Apps with Ruby On Rails | Episode 5: Implementing Business Rules through Validations, Migrations, and Lifecycle Hoo
Published: June 18, 2026
Duration: 17:51
In this lesson, you’ll learn about: enforcing low-level business rules in Ruby on Rails using validations, database constraints, and lifecycle hooks to ensure strong data integrity1. Understanding Business Rules🔹 Definition:
Business rules = constraints that define how data should behave🔹 Focus:
Low-level rules → apply directly to model attributes🔹 Examples:
A name must existA ticker symbol must follow a specific format👉 Key Insight
Business rules translate real-world requirements into enforceable logic2. Application-Level ValidationsUsing Ruby on Rails built-in validators:🔹 Common validations:
Business rules = constraints that define how data should behave🔹 Focus:
Low-level rules → apply directly to model attributes🔹 Examples:
A name must existA ticker symbol must follow a specific format👉 Key Insight
Business rules translate real-world requirements into enforceable logic2. Application-Level ValidationsUsing Ruby on Rails built-in validators:🔹 Common validations: