@jasonfb Did you find an alternative approach?

I've added the gem into my app, and the navbar responds the same way. The only difference is that I don't get that error in my console.

@jasonfb I started following this tutorial all to realize that I wasn't calling the appropriate ID here data-bs-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup".

That error is troubling so consider using the tutorial I linked which is pretty similar to what we've done in this app's readme except it will link to some other CDNs.

@jasonfb @WilliamMena
Some important things are missing from README.

You need to add some code to app/javascript/application.js

import "@hotwired/turbo-rails"
import "controllers"

// Notice here and import them in the following order
import "@popperjs/core"
import "bootstrap"

Problem solved.

I think I was using the wrong bootstrap code here. Either way , I got it working:
for JSBundling:
https://jasonfleetwoodboldt.com/courses/rails-7-crash-course/rails-7-jsbundling-with-esbuild-stimulus-turbo-bootstrap-circleci-up-running/

for Importmap:
https://jasonfleetwoodboldt.com/courses/rails-7-crash-course/rails-7-importmap-rails-with-bootstrap-stimulus-turbo-long-tutorial/