TypeError: can't modify immutable index

[Rakoth]

In rails 3.2 assets precompilation task failing with error message: "TypeError: can't modify immutable index". Here is example app for this problem: https://github.com/Rakoth/requirejs-rails-test-app I commented on #176 which introduce this error, but no activity there, so I decided create new issue.

[carsomyr]

@Rakoth Hey, thanks! Stuff like this goes a long way towards helping me fix this problem.

[rmdydo]

+1 Im getting this same issue with rails 4.0 when deploying to heroku.

[carsomyr]

@Rakoth @rmdydo Try my fork?

[rmdydo]

That did not work for me, however config.cache_classes does seem to be the issue. Originally it was set to true but when changing that to false, precomplication was successful. Seems like the issue is with config.cache_classes = false in engine.rb being overidden by the main app config?

[carsomyr]

@rmdydo Please paste a dump pf your Gemfile.lock.

[rmdydo]

https://gist.github.com/rmdydo/48fbcc4a99398b0be8d3

[carsomyr]

@rmdydo It looks like requirejs-rails is pointing to aar0nTw/requirejs-rails. I'm assuming that you tried out my fork?

[carsomyr]

@rmdydo Also, could you try bundle exec rake assets:precompile locally? You reported the problem as manifesting when deploying to Heroku.

[carsomyr]

@Rakoth FYI, your requirejs-rails-test-app project compiles fine after the changes. Please confirm.

[Rakoth]

@carsomyr confirmed, its work!

[carsomyr]

@rmdydo Let me know if you manage to reproduce the problem with a minimal set of gems while locally running bundle exec rake assets:precompile.

[rmdydo]

I cloned Rakoth's test app and am still getting while running bundle exec rake assets:precompile

GROUPS=assets rake aborted! Asset compilation with node failed with error:

/home/rdydo/.rvm/gems/ruby-2.1.2/bundler/gems/requirejs-rails-03aab50dd103/lib/tasks/requirejs-rails_tasks.rake:139:in block (3 levels) in <top (required)>' Tasks: TOP => requirejs:precompile:all => requirejs:precompile:run_rjs (See full trace by running task with --trace) rake aborted! Command failed with status (1): [/home/rdydo/.rvm/rubies/ruby-2.1.2/bin/rub...] /home/rdydo/.rvm/gems/ruby-2.1.2/bundler/gems/requirejs-rails-03aab50dd103/lib/tasks/requirejs-rails_tasks.rake:19:inruby_rake_task' /home/rdydo/.rvm/gems/ruby-2.1.2/bundler/gems/requirejs-rails-03aab50dd103/lib/tasks/requirejs-rails_tasks.rake:86:in `block (3 levels) in <top (required)>' Tasks: TOP => assets:precompile => requirejs:precompile:external (See full trace by running task with --trace)

[carsomyr]

@rmdydo You have to bundle update to pull down the latest changes on requirejs-rails master.

[rmdydo]

The fix does work for me on Rakoths test app using my orignal gemfile with both rails 3.2 and 4.0 but this was after commenting out the asset_sync gem, which would fail due to it not being configured. In my original project I do still get the immutable index exception duing precompile and the only gem file difference here is the asset_sync gem. Im guessing asset_sync is the culprit?

[carsomyr]

@rmdydo Make sure that config.cache_classes doesn't appear in your asset_sync.rb file.

[carsomyr]

@rmdydo Any luck getting it to work? What if you include asset_sync in your Gemfile but take no steps to configure it? I'm asking because you could try adding in one configuration setting after another, until one breaks precompilation.

[rmdydo]

No luck so far. I dont think it is asset_sync because I was able to get Rakoth's test app to successfully deploy with asset_sync configured. I also use ActiveAdmin and looked into this because that still uses sproket directives for js but after completely removing that I was still not able to successfully precompile. Im guessing its something specific about my app config or a gem that I'm using that is causing the issue. I plan to continue to rip out stuff until it works.

[carsomyr]

@rmdydo How about this idea: Print some info right before these lines of code. If you catch sprockets-rails freezing the environment before requirejs-rails gets to run, that's the reason.