Ruby on Rails Rails -Engines

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Engines can be considered miniature applications that provide functionality to their host applications. A Rails application is actually just a "supercharged" engine, with the Rails::Application class inheriting a lot of its behavior from Rails::Engine.

Engines are the reusable rails applications/plugins. It works like a Gem. Famous engines are Device, Spree gems which can be integrated with rails applications easily.


  • rails plugin new [engine name] --mountable


--mountableoption tells the generator that you want to create a "mountable" and namespace-isolated engine
--fulloption tells the generator that you want to create an engine, including a skeleton structure


Engines are very good options for creating reusable plugin for rails application

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