undefined method `first' for ActionDispatch::Response::RackBody

[tomca32]

When starting the application, the first request that results in a redirect will produce this error.

Seems that the first request completes fine and gets a 302 response, but the error seems to happen on the response to the following request.

From the logs:

2019-08-18 21:16:57.504511 I [18265:puma 003] {request_id: c7cfb1ce-3fcc-4406-a1a8-95cc8b2809a6} (75.1ms) ChaptersController -- Completed #create -- { :controller => "ChaptersController", :action => "create", :format => "HTML", :method => "POST", :path => "/chapters", :status => 302

2019-08-18 21:16:57.521405 D [18265:puma 003] {request_id: 102a4b3e-54d4-44da-b467-c9b7a4f70298} Rack -- Started -- { :method => "GET", :path => "/chapters", :ip => "127.0.0.1" }

2019-08-18 21:16:57.851207 I [18265:puma 003] {request_id: 102a4b3e-54d4-44da-b467-c9b7a4f70298} (308.8ms) ChaptersController -- Completed #index -- { :controller => "ChaptersController", :action => "index", :format => "HTML", :method => "GET", :path => "/chapters", :status => 200, :view_runtime => 264.01, :sk_rendered_format => :html, :sk_variant => [], :db_runtime => 20.98, :status_message => "OK" }

2019-08-18 21:16:57.880673 F [18265:puma 003 log_interceptor.rb:26] {request_id: 102a4b3e-54d4-44da-b467-c9b7a4f70298} Rails --
NoMethodError - undefined method `first' for #<ActionDispatch::Response::RackBody:0x00007fb2e93a7700>:

This doesn't seem to happen again on any following requests until the app has been restarted. Then it happens again on the first one.

[wagenet]

@tomca32 thanks for reporting this, and sorry for the trouble! We haven't seen anything like this before. Would you be willing to share your Gemfile with us? (If not publicly, maybe via our in-app messenger?) Also, is it possible for you to add a rescue in this method and tell us what arguments the method is being called with when it fails?

[tomca32]

Sure thing, thanks for checking this out. Here's the Gemfile. I'd love to add a rescue as well and check the args, but that link 404s for me.

# frozen_string_literal: true

source 'https://rubygems.org'

gem 'rails'
# Use postgres as the database for Active Record
gem 'pg'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'

gem 'devise'
gem 'omniauth-google-oauth2'
gem 'pundit'
gem 'rolify'
gem 'tiddle'

gem 'awesome_print'
gem 'rails_semantic_logger'

gem 'active_model_serializers', '~> 0.10.10'
gem 'bootsnap'
gem 'carrierwave'
gem 'carrierwave-bombshelter'
gem 'carrierwave-imageoptimizer'
gem 'cocoon'
gem 'enum_help'
gem 'fog-aws'
gem 'has_scope'
gem 'inline_svg'
gem 'marginalia'
gem 'mini_magick'
gem 'pagy'
gem 'pg_query', '>= 0.9.0'
gem 'pg_search'
gem 'pghero'
gem 'puma'
gem 'scenic'
gem 'simple_form'
gem 'skylight'
gem 'slim'
gem 'turbolinks'

gem 'mindleaps_analytics', path: ENV['MINDLEAPS_ANALYTICS_PATH'] if ENV['MINDLEAPS_ANALYTICS_PATH']

group :production do
  gem 'newrelic_rpm'
  gem 'SyslogLogger'
end

group :development, :test do
  gem 'apparition'
  gem 'bullet', '!= 6.0.0' # 6.0.0 seems to break with Turbolinks
  gem 'debase'
  gem 'rails-controller-testing'
  gem 'rubocop'
  gem 'rubocop-performance'
  gem 'rubocop-rails'
  gem 'ruby-debug-ide'
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug'

  # Rspec requires capybara > 2.1
  gem 'capybara', '> 2.1'
  gem 'coveralls', require: false
  gem 'database_cleaner'
  gem 'factory_bot_rails'
  gem 'faker'
  gem 'json_matchers'
  gem 'meta_request'
  gem 'pundit-matchers'
  gem 'rspec-rails'
  gem 'selenium-webdriver'
  gem 'shoulda-matchers'
  gem 'smarter_csv'
  gem 'webdrivers'
  gem 'webmock'
end

group :development do
  gem 'better_errors'
  gem 'binding_of_caller'
  gem 'dotenv-rails'
  # Access an IRB console on exception pages or by using <%= console %> in views
  gem 'web-console'

  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'pry'
  gem 'spring'
end

[zvkemp]

@tomca32 here is the correct link: https://github.com/skylightio/skylight-ruby/blob/v4.1.2/skylight-core/lib/skylight/core/middleware.rb#L41

[tomca32]

Thanks. Seems that args are [:first], and block is nil.

[tomca32]

Oh...seems this is coming from Bullet and is probably not Skylight's problem

[wagenet]

@tomca32 well I think maybe we should respond to body. I'll work it out with the team.