Rubygems: "Array values in the parameter are deprecated" warning not enough helpful ?

[benoittgt]

Hello

My current problem is when I'm running my rails server (rails console, rails server) I get the warning added by @tenderlove in https://github.com/rubygems/rubygems/commit/a6b69e94232166dda441bbb69b64cf90562eebfd . The problem is the answer doesn't help me a lot to fix it. I get

Array values in the parameter are deprecated. Please use a String or nil.
An Array was passed in from bin/rails:3:in `load'

How can I get more infos to be able to fix this warning?

This issue is related to:

• [ ] Network problems
• [ ] Installing a library
• [ ] Publishing a library
• [ ] The command line gem
• [x] Other

Here are my current environment details:

$ gem env version
2.6.2
$ rails --version
Rails 4.2.5.2

[tonyjleal]

I have the same problem
Here are my current environment details:

$ gem env version
2.6.2
$ rails --version
Rails 4.2.1

[cstump]

I started seeing this yesterday after upgrading my Rails 4.2.6 app to Ruby 2.3.0 via the official Ruby Docker image (ruby:2.3.0-slim). Rubygems v2.6.2. Wish I knew how to resolve.

[haggen]

Fixed by applying the same join you see here to the line 11 of bin/spring:

Gem.paths = { 'GEM_PATH' => [Bundler.bundle_path.to_s, *Gem.path].uniq.join(File::PATH_SEPARATOR) }

[benoittgt]

Thanks @haggen. That also fixed my issue. A PR has been made for Spring. https://github.com/rails/spring/pull/473/files

[kathyonu]

Thank You @haggen Your line lights our app right up. I ran into this on the rails -v command. The Lovely error message led me right here on a search. Running 4.2.5.1 on 2.3.0p0

[conf]

If you came to this issue by googling the error specified in the description of this issue, you should know that it has already been fixed in spring-1.6.4 and all you need to do is to update to latest spring and regenerate binstubs, like this:

$ bundle update spring && bundle exec spring binstub --remove --all && bundle exec spring binstub --all

[kirantpatil]

I am still getting it in rails 4.2.8 and ruby 2.4.1-x as below.

$ rails s
Array values in the parameter to Gem.paths= are deprecated.
Please use a String or nil.
An Array ({"GEM_PATH"=>["/home/fabritronix/.rvm/gems/ruby-2.4.1", "/home/fabritronix/.rvm/gems/ruby-2.4.1@global"]}) was passed in from bin/rails:3:in load' => Booting Puma => Rails 4.2.8 application starting in development on http://localhost:3000 => Runrails server -h` for more startup options
=> Ctrl-C to shutdown server
Puma starting in single mode...

• Version 3.8.2 (ruby 2.4.1-p111), codename: Sassy Salamander
• Min threads: 0, max threads: 16
• Environment: development
• Listening on tcp://localhost:3000
  Use Ctrl-C to stop

[NeoElit]

I'm not sure how am I affected with this when spring is not installed. (Env: Production). I'm getting this same warning when opening console.

Array values in the parameter to `Gem.paths=` are deprecated.
Please use a String or nil.
An Array ({"GEM_PATH"=>["/home/**redacted***/vendor/bundle/ruby/2.2.0"]}) was passed in from bin/rails:3:in `load'
Loading production environment (Rails 4.2.6)

rails: 4.2.6
ruby: 2.2.3 [Weirdly warning shows ruby 2.2.0 in the path :confused: ]
Env: production

[brendon]

@NeoElit, check your bin/rails file in your application directory. You'll likely find that array on line 3.