Rails 4: routing error when mounting an engine in a Rails app as explained in Rails guides

I followed steps on Rails guides on engines and it faileds when mounting the engine in unicorn Rails application:

unicorn rails s

=> Booting WEBrick

=> Rails 4.0.0 application starting in development on http://0.0.0.0:3000

=> Run rails server -h for more startup options

=> Ctrl-C to shutdown server

Exiting

/Users/scambour/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/application/routes_reloader.rb:10:in `rescue in execute_if_updated’: Rails::Application::RoutesReloader#execute_if_updated delegated to updater.execute_if_updated, but updater is nil: #<Rails::Application::RoutesReloader:0x007fc39aff04f0 @paths=["/Users/scambour/workspace/unicorn/config/routes.rb", “/Users/scambour/workspace/blorgh/config/routes.rb”], @route_sets=[#ActionDispatch::Routing::RouteSet:0x007fc39ac008b8, #ActionDispatch::Routing::RouteSet:0x007fc39c092c18]> (RuntimeError)

from /Users/scambour/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/application/routes_reloader.rb:6:in `execute_if_updated'

from /Users/scambour/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/application/finisher.rb:69:in `block in <module:Finisher>'

from /Users/scambour/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/initializable.rb:30:in `instance_exec'

from /Users/scambour/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/initializable.rb:30:in `run'

from /Users/scambour/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/initializable.rb:55:in `block in run_initializers'

from /Users/scambour/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/tsort.rb:150:in `block in tsort_each'

from /Users/scambour/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/tsort.rb:183:in `block (2 levels) in each_strongly_connected_component'

from /Users/scambour/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/tsort.rb:219:in `each_strongly_connected_component_from'

from /Users/scambour/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/tsort.rb:182:in `block in each_strongly_connected_component'

from /Users/scambour/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/tsort.rb:180:in `each'

from /Users/scambour/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/tsort.rb:180:in `each_strongly_connected_component'

from /Users/scambour/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/tsort.rb:148:in `tsort_each'

from /Users/scambour/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/initializable.rb:54:in `run_initializers'

from /Users/scambour/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/application.rb:215:in `initialize!'

from /Users/scambour/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/railtie/configurable.rb:30:in `method_missing'

from /Users/scambour/workspace/unicorn/config/environment.rb:5:in `<top (required)>'

from /Users/scambour/workspace/unicorn/config.ru:3:in `require'

from /Users/scambour/workspace/unicorn/config.ru:3:in `block in <main>'

from /Users/scambour/.rvm/gems/ruby-2.0.0-p247/gems/rack-1.5.2/lib/rack/builder.rb:55:in `instance_eval'

from /Users/scambour/.rvm/gems/ruby-2.0.0-p247/gems/rack-1.5.2/lib/rack/builder.rb:55:in `initialize'

from /Users/scambour/workspace/unicorn/config.ru:in `new'

from /Users/scambour/workspace/unicorn/config.ru:in `<main>'

from /Users/scambour/.rvm/gems/ruby-2.0.0-p247/gems/rack-1.5.2/lib/rack/builder.rb:49:in `eval'

from /Users/scambour/.rvm/gems/ruby-2.0.0-p247/gems/rack-1.5.2/lib/rack/builder.rb:49:in `new_from_string'

from /Users/scambour/.rvm/gems/ruby-2.0.0-p247/gems/rack-1.5.2/lib/rack/builder.rb:40:in `parse_file'

from /Users/scambour/.rvm/gems/ruby-2.0.0-p247/gems/rack-1.5.2/lib/rack/server.rb:277:in `build_app_and_options_from_config'

from /Users/scambour/.rvm/gems/ruby-2.0.0-p247/gems/rack-1.5.2/lib/rack/server.rb:199:in `app'

from /Users/scambour/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/commands/server.rb:48:in `app'

from /Users/scambour/.rvm/gems/ruby-2.0.0-p247/gems/rack-1.5.2/lib/rack/server.rb:314:in `wrapped_app'

from /Users/scambour/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/commands/server.rb:75:in `start'

from /Users/scambour/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/commands.rb:78:in `block in <top (required)>'

from /Users/scambour/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/commands.rb:73:in `tap'

from /Users/scambour/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/commands.rb:73:in `<top (required)>'

from bin/rails:4:in `require'

from bin/rails:4:in `<main>'

Just after adding the path to the blorgh engin into the Gemfile:

source ‘https://rubygems.org

Bundle edge Rails instead: gem ‘rails’, github: ‘rails/rails’

gem ‘rails’, ‘4.0.0’

gem ‘blorgh’, path: “…/blorgh”

running ‘rails s’ failed with the above error.

Any idea what is going wrong here ?

I’m on OS X 10.8.5

Rails 4.0.0

Ruby 2.0.0p247

Thanks

It is fixed, I just had a typo in engine route. :).

Can you please explain , how to add typo ?

I did NOT mean typo as Typo Software but the one as Typographical error :slight_smile: