Let’s say I have created a mountable engine into ~/my_engine folder: rails plugin new

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Asked: May 26, 20262026-05-26T20:36:10+00:00 2026-05-26T20:36:10+00:00

Let’s say I have created a mountable engine into ~/my_engine folder:

rails plugin new my_engine --mountable

How do I mount this engine into a Rails 3.1 app, that is at the same directory level (e.g. ~/my_app)?

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Editorial Team · Answer 1 · 2026-05-26T20:36:11+00:00

Editorial Team

There is a good writeup of the process here:

In short, add this to your main app’s Gemfile:

gem 'my_engine', :path => '../my_engine'

And run bundle install/bundle update. Add this to your main app

mount MyEngine::Engine => '/my-engine-url'

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