shopify app create rails w/ Rails 7 fails

[jbourassa]

Issue summary

I tried creating a new Rails app and ran into a few issues. Turns out I had Rails 7 installed, thus

1. The app was created in a --skip-spring, instead of using the name provided. Based on my quick experimentation, this behaviour changed in Rails 7 Fix: Fix rails new command for Rails 7 #1812
2. bundle install failed because rails new picked up Rails 7 alpha, and the shopify_app gem does not support Rails 7. Not sure what the best fix would be here, either make shopify_app Rails 7 ready, or hardcode a Rails version in the CLI that we know works.

Expected behavior

The Rails app is created and it all just works.

Actual behavior

Bundle install fails:

✓ Adding shopify_app gem…
┏━━ Running bundle install… ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
┃ Fetching gem metadata from https://rubygems.org/............
┃ Resolving dependencies...
┃ Bundler could not find compatible versions for gem "rails":
┃   In snapshot (Gemfile.lock):
┃     rails (= 7.0.0.alpha2)
┃
┃   In Gemfile:
┃     rails (~> 7.0.0.alpha2)
┃
┃     shopify_app (>= 17.0.3) was resolved to 17.1.1, which depends on
┃       rails (< 6.1, > 5.2.1)
┃
┃ Running `bundle update` will rebuild your snapshot from scratch, using only
┃ the gems in your Gemfile, which may resolve the conflict.
┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ (2.26s)
✗ System call failed: ~/.gem/ruby/3.0.2/bin/bundle install

Steps to reproduce the problem

1. Install Rails 7 (today, that's gem install rails --alpha)
2. shopify app create rails

[jacobburde]

I'm running into the same problem. Is there a workaround?

[jbourassa]

I'm running into the same problem. Is there a workaround?

You might be able to edit Shopify CLI's code to specify Rails version, e.g. Rails 6.1.

1. gem install rails -v '6.1.4.4'
2. Edit either lib/shopify_cli/services/app/create/rails_service.rb or lib/project_types/rails/commands/create.rb (not sure which file is actually used). Instead of having it run rails new, force a specific rails version: rails _6.1.4.4_ new. Note that the underscores are required.

[jacobburde]

I'm running into the same problem. Is there a workaround?

You might be able to edit Shopify CLI's code to specify Rails version, e.g. Rails 6.1.

1. `gem install rails -v '6.1.4.4'`

2. Edit either [`lib/shopify_cli/services/app/create/rails_service.rb`](https://github.com/Shopify/shopify-cli/blob/8a280492c44d458c44fde3883f16ecfd494afdc4/lib/shopify_cli/services/app/create/rails_service.rb#L161) or [`lib/project_types/rails/commands/create.rb`](https://github.com/Shopify/shopify-cli/blob/8a280492c44d458c44fde3883f16ecfd494afdc4/lib/project_types/rails/commands/create.rb#L158) (not sure which file is actually used). Instead of having it run `rails new`, force a specific rails version: `rails _6.1.4.4_ new`. Note that the underscores are required.

Thanks for the help! This resolved the initial issue but I ran into this later on in the install.
┏━━ Running webpacker:install…
┃ rails aborted!
┃ Don't know how to build task 'webpacker:install' (See the list of available tasks with rails --tasks)
┃
┃ (See full trace by running task with --trace)

┏━━ Error
┃ ✗ System call failed: rails webpacker:install
┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

I think it has to do with ruby 3.0.3. After switching to ruby 2.7.5 the command shopify app create rails worked without issue.