404 for /assets/bootstrap.js.map

[PascalTurbo]

I've added bootsrap gem to an existing rails application. In browser I get a 404 for the /assets/bootstrap.js.map file.

ActionController::RoutingError (No route matches [GET] "/assets/bootstrap.js.map"):

actionpack (5.1.4) lib/action_dispatch/middleware/debug_exceptions.rb:63:in `call'
web-console (3.5.1) lib/web_console/middleware.rb:135:in `call_app'
web-console (3.5.1) lib/web_console/middleware.rb:28:in `block in call'
web-console (3.5.1) lib/web_console/middleware.rb:18:in `catch'
web-console (3.5.1) lib/web_console/middleware.rb:18:in `call'
actionpack (5.1.4) lib/action_dispatch/middleware/show_exceptions.rb:31:in `call'
railties (5.1.4) lib/rails/rack/logger.rb:36:in `call_app'
railties (5.1.4) lib/rails/rack/logger.rb:24:in `block in call'
activesupport (5.1.4) lib/active_support/tagged_logging.rb:69:in `block in tagged'
activesupport (5.1.4) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (5.1.4) lib/active_support/tagged_logging.rb:69:in `tagged'
railties (5.1.4) lib/rails/rack/logger.rb:24:in `call'
sprockets-rails (3.2.1) lib/sprockets/rails/quiet_assets.rb:11:in `block in call'
activesupport (5.1.4) lib/active_support/logger_silence.rb:20:in `silence'
activesupport (5.1.4) lib/active_support/logger.rb:63:in `block (3 levels) in broadcast'
activesupport (5.1.4) lib/active_support/logger_silence.rb:20:in `silence'
activesupport (5.1.4) lib/active_support/logger.rb:61:in `block (2 levels) in broadcast'
sprockets-rails (3.2.1) lib/sprockets/rails/quiet_assets.rb:11:in `call'
actionpack (5.1.4) lib/action_dispatch/middleware/remote_ip.rb:79:in `call'
actionpack (5.1.4) lib/action_dispatch/middleware/request_id.rb:25:in `call'
rack (2.0.3) lib/rack/method_override.rb:22:in `call'
rack (2.0.3) lib/rack/runtime.rb:22:in `call'
activesupport (5.1.4) lib/active_support/cache/strategy/local_cache_middleware.rb:27:in `call'
actionpack (5.1.4) lib/action_dispatch/middleware/executor.rb:12:in `call'
actionpack (5.1.4) lib/action_dispatch/middleware/static.rb:125:in `call'
rack (2.0.3) lib/rack/sendfile.rb:111:in `call'
railties (5.1.4) lib/rails/engine.rb:522:in `call'
puma (3.10.0) lib/puma/configuration.rb:225:in `call'
puma (3.10.0) lib/puma/server.rb:605:in `handle_request'
puma (3.10.0) lib/puma/server.rb:437:in `process_client'
puma (3.10.0) lib/puma/server.rb:301:in `block in run'
puma (3.10.0) lib/puma/thread_pool.rb:120:in `block in spawn_thread'

[trentclowater]

It looks like the line in tasks/updater/js.rb that should have removed the source map annotations:

content = content.sub(%r{^//# sourceMappingURL=.*\n?\z}, '')

didn't actually do that for the beta2 release, for some reason.

[glebm]

I'll release a patched version.
In the meantime, use //= require bootstrap-sprockets instead of //= require bootstrap as a workaround.

[glebm]

Released 4.0.0.beta2.1 with this fix

[fabOnReact]

@glebm @PascalTurbo I had the same problem in production and I solved like this. I am not using the gem, but I installed bootstrap4 from source using yarn

I run RAILS_ENV=production bundle exec rake assets:precompile and the problem was solved..

bye
fabrizio