运行rails控制台时加载错误

Question

I am using rails 4.1 and ruby 2.1.1

Everything works, but when I run rails console I get this error

> rails console
Loading development environment (Rails 4.1.0)
load error: /home/andreas/.rvm/rubies/ruby-2.1.1/.irbrc
NoMethodError: undefined method `split' for nil:NilClass
    /home/andreas/.rvm/scripts/irbrc.rb:41:in `<top (required)>'

After the error the console opens and can be used.

Here's the 41th line and surroundings in the .irbrc file.

39 # Calculate the ruby string.
40 rvm_ruby_string = ENV["rvm_ruby_string"] ||
41 (ENV['GEM_HOME'] && ENV['GEM_HOME'].split(/\//).last.split(/@/).first) ||
42 ("#{RUBY_VERSION}-p#{RUBY_PATCHLEVEL}" rescue nil) ||
43 (RUBY_DESCRIPTION.split(" ")[1].sub('p', '-p') rescue nil ) ||
44 (`ruby -v` || '').split(" ")[1].sub('p', '-p')

I get these results when testing in the console

irb(main):008:0> ENV['GEM_HOME']
=> ""
irb(main):009:0> ENV['GEM_HOME'].split(/\//).last
=> nil

If I run irb outside the rails application, I get

2.1.1 :001 > ENV['GEM_HOME']
 => "/home/andreas/.rvm/gems/ruby-2.1.1" 
2.1.1 :002 > ENV['GEM_HOME'].split(/\//).last
 => "ruby-2.1.1" 

Do you know why the environment variable is blank in the rails application?

Answer 1

If you encounter this problem you should restart you computer . If that does not fix it read on.

The bin/spring file sets ENV["GEM_HOME"] to a blank string

bin/spring

11 ENV["GEM_PATH"] = ([Bundler.bundle_path.to_s] + Gem.path).join(File::PATH_SEPARATOR)
12 ENV["GEM_HOME"] = ""
13 Gem.paths = ENV

This crashes when running rails console because in line 41

ENV['GEM_HOME'].split(/\//).last

returns nil if ENV['GEM_HOME'] is blank

~/.rvm/rubies/ruby-2.1.1/.irbrc

39 # Calculate the ruby string.
40 rvm_ruby_string = ENV["rvm_ruby_string"] ||
41 (ENV['GEM_HOME'] && ENV['GEM_HOME'].split(/\//).last.split(/@/).first) ||
42 ("#{RUBY_VERSION}-p#{RUBY_PATCHLEVEL}" rescue nil) ||
43 (RUBY_DESCRIPTION.split(" ")[1].sub('p', '-p') rescue nil ) ||
44 (`ruby -v` || '').split(" ")[1].sub('p', '-p')

rvm uses the string to set the prompt message in the console. If you change line 12 in bin/spring to

ENV["GEM_HOME"] = "Spring is great!"

You get this nice prompt

bin/rails c
Loading development environment (Rails 4.1.0)
Spring is great! :001 > 

I don't really understand why ENV["GEM_HOME"] is set to a blank string. So, I just change this to get rid of the error. I have posted an issue on the spring github page.

Beware!

Any changes to the bin/spring file gets overwritten when you run the spring binstub command

Answer 2

I just encountered the same problem, and I solved it by spring stop . I think there is no need to restart the computer. What you should do is to restart spring.

Answer 3

These steps solved my problem:

• find the current ruby version

ruby -v

example:

ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-darwin13.0]

• remove this version

rvm remove 2.1.2

• install again

rvm install 2.1.2

Answer 4

You may just need to specify a gemset with

rvm gemset use YourGemset

I find it's a good idea to use a separate gemset for each project. Then place the name of that project's gemset in a file named .ruby-gemset in the root of your project. See https://rvm.io/workflow/projects for more info.