Fatal error when deploying production: LoadError: cannot load such file -- rubocop/rake_task

[kaydanzie]

When trying to run cap production deploy for PR #3 I got an error on the step deploy:assets:precompile. It's trying to run rake test when it shouldn't.

Error:

01 /usr/local/rbenv/bin/rbenv exec bundle exec rake assets:precompile
      01 rake aborted!
      01 LoadError: cannot load such file -- rubocop/rake_task
      01 /var/www/imposter/releases/20170825174722/lib/tasks/test.rake:1:in `require'
      01 /var/www/imposter/releases/20170825174722/lib/tasks/test.rake:1:in `<top (required)>'
      01 /var/www/imposter/shared/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/engine.rb:648:in `load'
      01 /var/www/imposter/shared/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/engine.rb:648:in `block in r…
      01 /var/www/imposter/shared/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/engine.rb:648:in `each'
      01 /var/www/imposter/shared/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/engine.rb:648:in `run_tasks_…
      01 /var/www/imposter/shared/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/application.rb:440:in `run_t…
      01 /var/www/imposter/shared/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/engine.rb:457:in `load_tasks'
      01 /var/www/imposter/releases/20170825174722/Rakefile:6:in `<top (required)>'
      01 /var/www/imposter/shared/bundle/ruby/2.4.0/gems/rake-12.0.0/exe/rake:27:in `<top (required)>'
      01 /usr/local/rbenv/versions/2.4.0/bin/bundle:22:in `load'
      01 /usr/local/rbenv/versions/2.4.0/bin/bundle:22:in `<main>'
      01 (See full trace by running task with --trace)

[tatwell]

The configuration looks identical to Cascade Assets where we are not hitting this error. I wonder if Rails 5 changed the way it loads libraries so that it now preloads all lib/tasks files.

If it were to do something like this, it would explain why it executes require 'rubocop/rake_task' in this case causing the error and not in Cascade Assets.

[tatwell]

Try moving the require statement under the task block as suggested here:

# Add additional test suite definitions to the default test task here
namespace :test do
  desc 'Runs RuboCop on specified directories'
  RuboCop::RakeTask.new(:rubocop) do |task|
    require 'rubocop/rake_task'

[tatwell]

I think the explanation is in here somewhere:

• https://stackoverflow.com/a/40019108/6763239

[kaydanzie]

After a little research, I haven't come across any good workarounds. It's hard to find anyone reporting a similar issue from what I can tell. I am not familiar with capistrano at all or configuring deployment.

The temporary resolution at this point is just to remove the group :test from the Gemfile for rubocop.

[tatwell]

That works for me for now. Leave this issue open and I expect an answer will turn up eventually.

[kaydanzie]

Came across this again in Newsroom, which is also running Rails 5. I resolved it by following the recommendation in this issue to move the rubocop gem outside the test group in the Gemfile. There isn't anything in the Rubocop documentation or issues that offers a good recommendation on how to handle. Since it's not really a big deal to require the gem in all environments, we're just going to leave it there for now and close this issue.

[diasjorge]

For anyone that ends up here I found this an acceptable solution.

begin
  require 'rubocop/rake_task'
  RuboCop::RakeTask.new do |t|
    t.options = ['--display-cop-names']
  end
rescue LoadError
end