Rails Keeps Telling Me That It's Not Currently Installed

Rails keeps telling me that it's not currently installed

I had this problem today. Not completely related to your question, but since this page is what comes up in Google when I search for "Rails is not currently installed on this system", I thought I would add my answer:

What happened is that I was using ruby 1.9.2 with rails for a while, but then I needed to use ruby 1.8.7 to run some other script that I found.

Afterwards, I wanted to change by system back to using 1.9.2, and that's where the problem started:

$ rvm list

=> ruby-1.8.7-p352 [ x86_64 ]
ruby-1.9.2-p290 [ x86_64 ]


$ rvm use 1.9.2

I thought that would do the trick. But no, that gives me the "Rails is not currently installed on this system" message.

What I had forgotten is that I had configured rails using an rvm gemset. So I needed to specify the correct gemset when I was selecting which ruby version to make active.

$ rvm gemset list_all


gemsets for ruby-1.8.7-p352 (found in /Users/asgeo1/.rvm/gems/ruby-1.8.7-p352)
global


gemsets for ruby-1.9.2-p290 (found in /Users/asgeo1/.rvm/gems/ruby-1.9.2-p290)
global
rails31


$ rvm use ruby-1.9.2-p290@rails31

That did the trick.

Mac OS X Mountain Lion Rails is not currently installed on this system.

Use RVM http://rvm.io or rbenv to install newer Rails versions than what come pre-installed with OS X.

Follow examples on the site https://rvm.io/rvm/install/ but basically:

Install RVM: $ \curl -L https://get.rvm.io | bash -s stable

You can then $rvm list known to see what Rubies are available to you (lots). And simply $rvm install 1.9.3 to get the most current version of Ruby (which as of this writing is ruby-1.9.3-p327)

Set that ruby as your default $rvm --default use 1.9.3

Create a default gemset to store your gems $rvm use 1.9.3@mygemset --create --default

Then install Rails $ gem install rails will get you current which today is same as typing gem install rails -v 3.2.9

Gemset: Rails is not currently installed on this system.

macbook$ rvm use ruby-1.9.3-p194
Using /Users/macbook/.rvm/gems/ruby-1.9.3-p194
macbook$ rails --version
Rails 3.2.11

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