'rvm use' command seems to have no effect the first time it is run

[Aaron]

It seems that the first time I run ' rvm use' and then try to do something I get an error message about the last gem I installed not being found.

I run 'rvm use' again and then I can use rails fine. Look at the sequence below. Very puzzling. Any suggestions as to why this happens?

 

me@me-VirtualBox:~$ bash -l
me@me-VirtualBox:~$ rvm use 2.0.0@r4
Using /home/me/.rvm/gems/ruby-2.0.0-p353 with gemset r4
me@me-VirtualBox:~$ cd rails_proj/sample_app/
RVM used your Gemfile for selecting Ruby, it is all fine - Heroku does that too,
you can ignore these warnings with 'rvm rvmrc warning ignore /home/me/rails_proj/sample_app/Gemfile'.
To ignore the warning for all files run 'rvm rvmrc warning ignore allGemfiles'.

me@me-VirtualBox:~/rails_proj/sample_app$ rails console
Could not find bcrypt-ruby-3.1.2 in any of the sources   <<<<Why do I get this error?
Run `bundle install` to install missing gems.
me@me-VirtualBox:~/rails_proj/sample_app$ rvm use 2.0.0@r4   <<<I rerun the same command and now it works
Using /home/me/.rvm/gems/ruby-2.0.0-p353 with gemset r4
me@me-VirtualBox:~/rails_proj/sample_app$ rails console
Loading development environment (Rails 4.0.2)   <<<now no error
2.0.0p353 :001 >

[Vineel Sonnathi]

You have to be at the root of the project when u use rvm. If you navigate away from root folder, then you have to do rvm again.

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[Jason Noble]

Try the following:

echo ‘2.0.0’ > ~/rails_proj/sample_app/.ruby-version

echo ‘r4’ > ~/rails_proj/sample_app/.ruby-gemset

cd ~/rails_proj/sample_app

rvm current             # => Should say 2.0.0@r4

Basically, I think the issue is you told RVM to use the right Ruby and Ruby Gemset, but then you cd’d to a directory.  When you change into a directory, RVM looks for .ruby-version and/or .ruby-gemset and if it finds them uses them to setup RVM for that directory.  If it does not find them, it looks in your Gemfile where you have a ruby 2.0.0 line, and uses that.

Anyone know if you can specify a gemset via the Gemfile?  It’d be nice to not have to create the .ruby-version and .ruby-gemset files all the time…

Jason