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Cyclic dependency error after removing mathjax-rails

So My Gemfile currently looks like

source 'https://rubygems.org' # Bundle edge Rails instead: gem 'rails', github: 'rails/rails' gem 'rails', '4.2.4' # Use sqlite3 as the database for Active Record gem 'sqlite3' # Use SCSS for stylesheets gem 'sass-rails', '~> 5.0' # Use Uglifier as compressor for JavaScript assets gem 'uglifier', '>= 1.3.0' # Use CoffeeScript for .coffee assets and views gem 'coffee-rails', '~> 4.1.0' # See https://github.com/rails/execjs#readme for more supported runtimes # gem 'therubyracer', platforms: :ruby # Use jquery as the JavaScript library gem 'jquery-rails' # Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks gem 'turbolinks' # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder gem 'jbuilder', '~> 2.0' # bundle exec rake doc:rails generates the API under doc/api. gem 'sdoc', '~> 0.4.0', group: :doc gem 'mathjax-rails', '~> 2.5', '>= 2.5.1' gem 'bootstrap-sass', '~> 3.3', '>= 3.3.5.1' # Use ActiveModel has_secure_password # gem 'bcrypt', '~> 3.1.7' # Use Unicorn as the app server # gem 'unicorn' # Use Capistrano for deployment # gem 'capistrano-rails', group: :development group :development, :test do # Call 'byebug' anywhere in the code to stop execution and get a debugger console gem 'byebug' end group :development do # Access an IRB console on exception pages or by using <%= console %> in views gem 'web-console', '~> 2.0' # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring gem 'spring' end

It works great. Funny how, as soon as I mathjax-rails and try to run in production mode, I get

 /usr/local/rvm/gems/ruby-2.2.1/gems/actionpack-4.2.4/lib/action_dispatch/routing/url_for.rb:99:in `append_features': cyclic include detected (ArgumentError) from /usr/local/rvm/gems/ruby-2.2.1/gems/actionpack-4.2.4/lib/action_dispatch/routing/url_for.rb:99:in `include' from /usr/local/rvm/gems/ruby-2.2.1/gems/actionpack-4.2.4/lib/action_dispatch/routing/url_for.rb:99:in `block in <module:UrlFor>' from /usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.2.4/lib/active_support/concern.rb:120:in `class_eval' from /usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.2.4/lib/active_support/concern.rb:120:in `append_features' from /usr/local/rvm/gems/ruby-2.2.1/gems/actionview-4.2.4/lib/action_view/railtie.rb:41:in `include' from /usr/local/rvm/gems/ruby-2.2.1/gems/actionview-4.2.4/lib/action_view/railtie.rb:41:in `block (2 levels) in <class:Railtie>' from /usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.2.4/lib/active_support/lazy_load_hooks.rb:38:in `instance_eval' from /usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.2.4/lib/active_support/lazy_load_hooks.rb:38:in `execute_hook' from /usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.2.4/lib/active_support/lazy_load_hooks.rb:45:in `block in run_load_hooks' from /usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.2.4/lib/active_support/lazy_load_hooks.rb:44:in `each' from /usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.2.4/lib/active_support/lazy_load_hooks.rb:44:in `run_load_hooks' from /usr/local/rvm/gems/ruby-2.2.1/gems/actionpack-4.2.4/lib/action_controller/base.rb:266:in `<class:Base>' from /usr/local/rvm/gems/ruby-2.2.1/gems/actionpack-4.2.4/lib/action_controller/base.rb:164:in `<module:ActionController>' from /usr/local/rvm/gems/ruby-2.2.1/gems/actionpack-4.2.4/lib/action_controller/base.rb:5:in `<top (required)>' from /root/StudySome/app/controllers/application_controller.rb:1:in `<top (required)>' from /usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:274:in `require' from /usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:274:in `block in require' from /usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:240:in `load_dependency' from /usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:274:in `require' from /usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:360:in `require_or_load' from /usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:317:in `depend_on' from /usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:233:in `require_dependency' from /usr/local/rvm/gems/ruby-2.2.1/gems/railties-4.2.4/lib/rails/engine.rb:472:in `block (2 levels) in eager_load!' from /usr/local/rvm/gems/ruby-2.2.1/gems/railties-4.2.4/lib/rails/engine.rb:471:in `each' from /usr/local/rvm/gems/ruby-2.2.1/gems/railties-4.2.4/lib/rails/engine.rb:471:in `block in eager_load!' from /usr/local/rvm/gems/ruby-2.2.1/gems/railties-4.2.4/lib/rails/engine.rb:469:in `each' from /usr/local/rvm/gems/ruby-2.2.1/gems/railties-4.2.4/lib/rails/engine.rb:469:in `eager_load!' from /usr/local/rvm/gems/ruby-2.2.1/gems/railties-4.2.4/lib/rails/engine.rb:346:in `eager_load!' from /usr/local/rvm/gems/ruby-2.2.1/gems/railties-4.2.4/lib/rails/application/finisher.rb:56:in `each' from /usr/local/rvm/gems/ruby-2.2.1/gems/railties-4.2.4/lib/rails/application/finisher.rb:56:in `block in <module:Finisher>' from /usr/local/rvm/gems/ruby-2.2.1/gems/railties-4.2.4/lib/rails/initializable.rb:30:in `instance_exec' from /usr/local/rvm/gems/ruby-2.2.1/gems/railties-4.2.4/lib/rails/initializable.rb:30:in `run' from /usr/local/rvm/gems/ruby-2.2.1/gems/railties-4.2.4/lib/rails/initializable.rb:55:in `block in run_initializers' from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/tsort.rb:226:in `block in tsort_each' from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/tsort.rb:348:in `block (2 levels) in each_strongly_connected_component' from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/tsort.rb:429:in `each_strongly_connected_component_from' from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/tsort.rb:347:in `block in each_strongly_connected_component' from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/tsort.rb:345:in `each' from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/tsort.rb:345:in `call' from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/tsort.rb:345:in `each_strongly_connected_component' from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/tsort.rb:224:in `tsort_each' from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/tsort.rb:203:in `tsort_each' from /usr/local/rvm/gems/ruby-2.2.1/gems/railties-4.2.4/lib/rails/initializable.rb:54:in `run_initializers' from /usr/local/rvm/gems/ruby-2.2.1/gems/railties-4.2.4/lib/rails/application.rb:352:in `initialize!' from /root/StudySome/config/environment.rb:5:in `<top (required)>' from /root/StudySome/config.ru:3:in `require' from /root/StudySome/config.ru:3:in `block in <main>' from /usr/local/rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/builder.rb:55:in `instance_eval' from /usr/local/rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/builder.rb:55:in `initialize' from /root/StudySome/config.ru:in `new' from /root/StudySome/config.ru:in `<main>' from /usr/local/rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/builder.rb:49:in `eval' from /usr/local/rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/builder.rb:49:in `new_from_string' from /usr/local/rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/builder.rb:40:in `parse_file' from /usr/local/rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/server.rb:299:in `build_app_and_options_from_config' from /usr/local/rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/server.rb:208:in `app' from /usr/local/rvm/gems/ruby-2.2.1/gems/railties-4.2.4/lib/rails/commands/server.rb:61:in `app' from /usr/local/rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/server.rb:336:in `wrapped_app' from /usr/local/rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/server.rb:272:in `start' from /usr/local/rvm/gems/ruby-2.2.1/gems/railties-4.2.4/lib/rails/commands/server.rb:80:in `start' from /usr/local/rvm/gems/ruby-2.2.1/gems/railties-4.2.4/lib/rails/commands/commands_tasks.rb:80:in `block in server' from /usr/local/rvm/gems/ruby-2.2.1/gems/railties-4.2.4/lib/rails/commands/commands_tasks.rb:75:in `tap' from /usr/local/rvm/gems/ruby-2.2.1/gems/railties-4.2.4/lib/rails/commands/commands_tasks.rb:75:in `server' from /usr/local/rvm/gems/ruby-2.2.1/gems/railties-4.2.4/lib/rails/commands/commands_tasks.rb:39:in `run_command!' from /usr/local/rvm/gems/ruby-2.2.1/gems/railties-4.2.4/lib/rails/commands.rb:17:in `<top (required)>' from bin/rails:4:in `require' from bin/rails:4:in `<main>' => Booting WEBrick => Rails 4.2.4 application starting in production on http://159.203.240.211:80 => Run `rails server -h` for more startup options => Ctrl-C to shutdown server Exiting

Why?! I just want to download MathJax from the CDN MathJax ...

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1 answer

Even if you removed the gem, you may have several mathjax links left in your code. In the instructions for use for the gem, it seems that you need to add the routes.rb code, as well as app/views/layouts/application.html.erb . If these links exist, their removal should be fixed.

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