Why does rvm switch gemsets when I cd into my rails project directory?

2
votes

For what possible reason would rvm switch gemsets when I cd into my rails project directory?

I don't have an .rvmrc file. I set a default gemset (which "sticks" for other directories). Here's what I mean:

[20130109_234306] will@localhost:~
$ rvm gemset list

gemsets for ruby-1.9.3-p362 (found in /Users/will/.rvm/gems/ruby-1.9.3-p362)
   (default)
   global
=> ruby-1.9.3

[20130109_234313] will@localhost:~
$ cd Projects/rails_project

[20130109_234320] will@localhost:~/Projects/rails_project
$ rvm gemset list

gemsets for ruby-1.9.3-p362 (found in /Users/will/.rvm/gems/ruby-1.9.3-p362)
=> (default)
   global
   ruby-1.9.3
4
ruby-on-railsrvm

4 Answers

5
votes

The Gemfile in the rails project directory will tell RVM to switch rubies if the Gemfile specifies a ruby version (something like ruby="1.9.3" or #ruby=1.9.3@gemset).

This is because RVM supports more then just .rvmrc => https://rvm.io/workflow/projects/#ruby-versions a full list can be found here: https://github.com/wayneeseguin/rvm/blob/master/scripts/functions/rvmrc#L743-L744

Note that RVM will check the following files before the Gemfile: .rvmrc .versions.conf .ruby-version .rbfu-version .rbenv-version. So creating a .rvmrc file with the line "rvm use ruby-1.9.3-p362@ruby-1.9.3" would make RVM ignore the Gemfile.

1
votes

RVM has a feature called Project .rvmrc. In ~/Projects/rails_project there is a file called .rvmrc, which contains instructions for RVM for when you move into that project.

Edit: I missed the line about you not having that file. Sorry.

1
votes

You can disable the project .rvmrc which disables project Gemfile checking as well. To do this, add the following line to /etc/rvmrc or ~/.rvmrc. Then you wont have to add a .rvmrc file to any project, as they will be ignored with the Gemfile. This was tested on rvm 1.19.6 (Stable).

rvm_project_rvmrc=0

Source: https://rvm.io/workflow/rvmrc

0
votes

have two way at least to achieve this, eg：

  1. echo 2.1.1 > .ruby-version and echo rails4 > .ruby-gemset

  2. add first line #ruby=2.1.1@rails4 to Gemfile

why .ruby-gemset ?

.ruby-version also supports gemsets in the form of ruby@gemset but this is not compatible with other Ruby Versions Managers. Another file might be used to specify the gemset without breaking compatibility - .ruby-gemset.

I think above is the best practice .