Spring can't run Rails server when developing an engine

[davidmles]

Steps to reproduce:

rails plugin new example --mountable
cd example/
echo "gem 'spring'" >> Gemfile
bundle
echo "Spring.application_root = './test/dummy'" > config/spring.rb
bundle exec spring binstub --all

Trying to start the server from the engine directory:

example david$ spring rails s
Spring was unable to find your config/application.rb file. Your project root was detected at /Users/david/Sites/example, so spring looked for /Users/david/Sites/example/config/application.rb but it doesn't exist. You can configure the root of your application by setting Spring.application_root in config/spring.rb.

Trying to start the Rails console from the engine directory:

example david$ spring rails c
/Users/david/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/spring-1.1.3/lib/spring/configuration.rb:37:in `pwd': No such file or directory - getcwd (Errno::ENOENT)
    from /Users/david/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/spring-1.1.3/lib/spring/configuration.rb:37:in `project_root_path'
    from /Users/david/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/spring-1.1.3/lib/spring/configuration.rb:28:in `application_root_path'
    from /Users/david/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/spring-1.1.3/lib/spring/application.rb:243:in `loaded_application_features'
    from /Users/david/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/spring-1.1.3/lib/spring/application.rb:105:in `ensure in preload'
    from /Users/david/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/spring-1.1.3/lib/spring/application.rb:110:in `preload'
    from /Users/david/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/spring-1.1.3/lib/spring/application.rb:140:in `serve'
    from /Users/david/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/spring-1.1.3/lib/spring/application.rb:128:in `block in run'
    from /Users/david/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/spring-1.1.3/lib/spring/application.rb:122:in `loop'
    from /Users/david/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/spring-1.1.3/lib/spring/application.rb:122:in `run'
    from /Users/david/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/spring-1.1.3/lib/spring/application/boot.rb:18:in `<top (required)>'
    from /Users/david/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /Users/david/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from -e:1:in `<main>'

Enter the dummy directory:

cd test/dummy/

Trying to start the Rails server using the rails bin file directly:

dummy david$ bin/rails s
Spring was unable to find your config/application.rb file. Your project root was detected at /Users/david/Sites/example, so spring looked for /Users/david/Sites/example/config/application.rb but it doesn't exist. You can configure the root of your application by setting Spring.application_root in config/spring.rb.

Trying to start the Rails server using Spring:

dummy david$ spring rails s
Spring was unable to find your config/application.rb file. Your project root was detected at /Users/david/Sites/example, so spring looked for /Users/david/Sites/example/config/application.rb but it doesn't exist. You can configure the root of your application by setting Spring.application_root in config/spring.rb.

Using Rails 4.1.4 and Ruby 2.1.2p95 on OS X Mavericks 10.9.4

[Irio]

Experiencing the same issue on Rails 4.1.5 and Ruby 2.1.3p242.

Doing the following as said in the README does not seem to fix it.

$ cd <engine path>
$ echo "Spring.application_root = './spec/dummy'" > config/spring.rb

[heberuriegas]

+1, but is curious, the problem is only presented executing rails console

[fredmcgroarty]

i have the same issue as woohoou. This has only cropped up in the last few days

[itsterry]

Here's 2 ways that work for me. The first is nicer, but seems a little shaky. The second seems robust and quite quick but is hacky:

Method 1 - Nice but Flaky

Assuming that we're in the root of your engine, and your dummy app is in test/dummy:

In config/spring.rb, make sure you have the following:

  Spring.application_root='test/dummy'

And in test/dummy/config/spring.rb, make sure you have the following:

  Spring.application_root=''

To start your server:

cd test/dummy; rails s

To start your console:

cd test/dummy; rails c

Method 2 - Hacky but Steady

In config/spring.rb, make sure you have the following:

  Spring.application_root =File.expand_path(File.dirname(__FILE__)).gsub(/\/test\/dummy\/config/,'')+'/test/dummy'

And in test/dummy/config, make a symlink to that file:

cd test/dummy/config; ln -s ../../../config/spring.rb spring.rb

As I said: a bit hacky! :)

[davidmles]

@itsterry none of those two methods work for me on Rails 4.2

Worth noting that with Rails 4.2 now the only thing not working is the server:

example david$ spring rails s
Spring was unable to find your config/application.rb file. Your project root was detected at /Users/david/Sites/example, so spring looked for /Users/david/Sites/example/config/application.rb but it doesn't exist. You can configure the root of your application by setting Spring.application_root in config/spring.rb.

The console and rake work:

example david$ spring rails c
Loading development environment (Rails 4.2.0)

example david$ spring rake -T
/Users/david/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/railties-4.2.0/lib/rails/tasks/statistics.rake:4: warning: already initialized constant STATS_DIRECTORIES
/Users/david/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/railties-4.2.0/lib/rails/tasks/statistics.rake:4: warning: previous definition of STATS_DIRECTORIES was here
rake app:about
...

[tvdeyen]

The 1. method from @itsterry works for me. Thanks.

[rjayroach]

For anyone who happens here and the above solutions don't work. I had the same error

spring rails s
Spring was unable to find your config/application.rb file. Your project root was detected at /Users/david/Sites/example, so spring looked for /Users/david/Sites/example/config/application.rb but it doesn't exist. You can configure the root of your application by setting Spring.application_root in config/spring.rb.

Running rails 4.2.4 on ruby 2.2.2p95.
The above solutions worked only partially. What did work was:

ENGINE_ROOT/config/spring.rb

Spring.applicaiton_root = 'spec/dummy'

With just that change, what worked was:

cd ENGINE_ROOT
spring rails c
spring rake -T

spring rails s still failed with above error.

How I got that working was:

cd ENGINE_ROOT/spec/dummy
touch Gemfile

Now from ENGINE_ROOT/spec/dummy: spring rails s

Without the empty Gemfile the error message was triggered from: https://github.com/rails/spring/blob/master/lib/spring/configuration.rb#L43

[tjcjc]

1. Add this code ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../../../Gemfile', __FILE__) to the first line of spec/dummy/spring.
2. Add Spring.application_root='spec/dummy' to config/spring.rb

[wkrsz]

@tjcjc did you mean adding it to first line of spec/dummy/config/spring.rb, spec/dummy/.spring.rb or spec/dummy/bin/spring?

None of above worked for me, but running below command from spec/dummy did:

spec/dummy$ BUNDLE_GEMFILE=../../Gemfile rails s

[obromios]

spec/dummy$ BUNDLE_GEMFILE=../../Gemfile rails s
worked for me.

[markdiginomad]

I solved this problem. My gemini duplicate program placed the config file in the trash, had to put back. Gemini - please fix this bug. Anyone has this problem check your config file.

[aaronjensen]

For those of you who have this working, does bin/rails g generate things in the right place?