Simple_form: rails g simple_form:install hangs with Ruby 2.7.1

[mmhan]

Environment

• Ruby 2.7.1
• Rails 6.0.3.2
• Simple Form 5.0.2

Current behavior

After adding simple_form to Gemfile and bundle install, running rails g simple_form:install will not generate any file and the process will keep running forever until you Ctrl+C.

I have searched around and the trick to restart the terminal didn't work either.

If I switched to Ruby 2.6.5, it works.

[carlosantoniodasilva]

I was unable to repro this using Ruby 2.7.1 on a newly generated Rails app:

$ rails g simple_form:install
[Simple Form] Simple Form is not configured in the application and will use the default values. Use `rails generate simple_form:install` to generate the Simple Form configuration.
SimpleForm 3 supports Bootstrap and Zurb Foundation 5. If you want a configuration that is compatible with one of these frameworks, then please re-run this generator with --bootstrap or --foundation as an option.
      create  config/initializers/simple_form.rb
       exist  config/locales
      create  config/locales/simple_form.en.yml
      create  lib/templates/erb/scaffold/_form.html.erb

$ ruby -v
ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-darwin19]

$ rails -v
Rails 6.0.3.3

$ bundle info simple_form
  * simple_form (5.0.2)
    Summary: Forms made easy!
    Homepage: https://github.com/heartcombo/simple_form

If you can provide a sample script/app that shows the issue, we will be happy to investigate further. Thanks!

[jaredjackson]

Most likely this is an issue with the Spring gem. Try removing it from your Gemfile, bundle, then try again to install Simple Form.

[JESii]

Per @jaredjackson above, removing the spring gem fixed the problem.

[mmhan]

For closure, yes, restarting or stopping spring gem will solve the problem.