Can't run the app after unplugging the React frontend

[remy727]

I unplugging the React frontend by following the steps in Wiki page.

But I can't preview the app. I ran the app using Ngrok tunnel but I always have ERR_NGROK_8012 error. I tried different ports and checked firewall but the same error. I tried original ruby template but it worked well.
You can reproduce the issue on shopify-app-template-ruby-demo

[cesarho]

@remy727

By changing the roles in shopify.web.toml from "backend" to "frontend", the CLI could pick the correct port in bring up the dev server.

roles = ["frontend"]

[commands]
dev = "bin/rails server"

Here is the reference: https://shopify.dev/docs/apps/build/cli-for-apps/migrate-to-latest-cli#node-js-or-rails

[remy727]

It works. Thank you, @cesarho 👍

[remy727]

@lizkenyon, can we include this change in Wiki page?

# shopify.web.toml

roles = ["frontend"]

[commands]
dev = "bin/rails server"

[matteodepalo]

Thank you @remy727, I've updated the wiki.