Rails Concerns vs. Modules and when to use each

As a novice or professional Ruby on Rails developer, you're likely familiar with the concepts of Concerns and Modules. Both are used to organize and reuse code but have different purposes and distinct use cases.

In this post, I’ll tap into the differences between Rails Concerns and Modules, provide real code examples, and discuss best practices for when to use each.

What are Concerns?

Rails Concerns are a way to extract functionality from models, controllers, and other classes into reusable modules. They were introduced in Rails 4 as a replacement for the old "model concern" pattern. Concerns are typically used to share code between models, controllers, or other classes that have similar functionality.

What are Modules?

Modules are a way to organize namespace-related code. They can be used to group related classes, methods, and constants. Modules are often used to create a namespace for utility methods or to encapsulate more complex logic. If your actual models become huge, extracting to an independent module might be a good focus.

Read the full tutorial here: https://webcrunch.com/posts/rails-concerns-vs-modules

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