importmap-rails: NoMethodError: private method `importmap=' called

I’m updating importmap-rails from 0.6.1 to 0.7.6 and I get the following error:

NoMethodError: private method `importmap=' called for #<XXXX::Application:0x000056001ecded98>
/home/runner/work/xxxx/xxxx/vendor/bundle/ruby/2.6.0/gems/importmap-rails-0.7.6/lib/importmap/engine.rb:14:in `block in <class:Engine>'

importmap-rails 0.7.6
stimulus-rails 0.6.0
turbo-rails 0.8.1
rails 6.1.4.1

# config/importmap.rb

pin 'bootstrap', to: 'https://cdn.skypack.dev/bootstrap'
pin '@hotwired/turbo-rails', to: 'turbo.js'
pin '@hotwired/stimulus', to: 'stimulus.js'
pin '@hotwired/stimulus-autoloader', to: 'stimulus-autoloader.js'
pin '@hotwired/stimulus-importmap-autoloader', to: 'stimulus-importmap-autoloader.js'
pin '@rails/activestorage', to: 'https://cdn.skypack.dev/@rails/activestorage'
pin '@rails/actioncable', to: 'https://cdn.skypack.dev/@rails/actioncable'
pin 'trix', to: 'https://cdn.skypack.dev/trix'
pin '@rails/actiontext', to: 'https://cdn.skypack.dev/@rails/actiontext'

pin_all_from 'app/assets/javascripts/channels', under: 'channels'
pin_all_from 'app/assets/javascripts/controllers', under: 'controllers'

pin 'application'

About this issue

Original URL
State: closed
Created 3 years ago
Comments: 15 (6 by maintainers)

Commits related to this issue

Fix private method 'importmap=' error, [check description] https://github.com/rails/importmap-rails/issues/47 — committed to DariusPirvulescu/rails-yelp-mvp by DariusPirvulescu 2 years ago

Most upvoted comments

@javierav . I’ve had this same problem on ruby 2.6.8. Unfortunately I am stuck here until jruby 9.4.0.0 is released. There doesn’t seem to be anything wrong with the Rails::Application.send(:attr_accessor, :importmap) call, other than it doesn’t seem to get executed when run under ruby < 2.7.

My workaround (that seems to be working so far) is to simply add attr_accessor :importmap in the application class definition in config/application.rb.

jefflasslett on Oct 7, 2021

This issue is fixed on JRuby master (9.4) and will not be an issue at release.

headius on Apr 26, 2022

JRuby 9.4 will be out soon with support for Ruby 3.1 and Rails 7.

headius on Apr 26, 2022

Rails 7 is going to require Ruby 2.7 as the minimum.

dhh on Oct 7, 2021