问题
I'm going through the rails by example tutorial.
Its seems that every time I close terminal rails defaults back to 2.3.5 & I have to go through the process of installing 3.0.3 every time I open the terminal?
I installed rails using: $ [sudo] gem install rails --version 3.0.3
Has anyone experienced a similar issue? I've tried googling around and searching stack to no avail.
回答1:
Try uninstalling the rails gem:
gem uninstall rails
If you are prompted to select a version, select 2.3.5 and leave the 3.0.3 version intact.
P.S: Are you using RVM? If not, I would highly recommend it.
回答2:
The problem is almost-assuredly RVM interpreting 2.3.5 as your default rails version in your default gem set. I ran into this problem myself when first experimenting with RVM. Try this:
rvm --default use 1.9.2 (or whatever you want your default ruby interpreter to be)
rvm gemset create rails-3.0.3
rvm use 1.9.2@arails-3.0.3 --default
gem install rails
That will:
- Set your default ruby interpreter to the desired ruby version
- Create a gemset for your Rails 3.0.3 install and make it your default gemset
- Install rails
Once you close the terminal and open it back up, it'll load RVM's defaults, putting you back on Rails 3.0.3 again.
回答3:
I've had this problem using RVM, if you're using RVM do: $rvm 1.9.2 (or whatever ruby version you installed the rails 3 gem with).
Check the output of $ ruby -v when you seem to have access to rails3 and again $ ruby -v when you can only seem to get to v2.3.5. If it shows different versions of ruby then you most likley are using RVM.
回答4:
@Ads If youre using RVM and you install rails using sudo like so
$ [sudo] gem install rails --version 3.0.3
youre doing it wrong. RVM depends on you using a ruby distro that was installed by RVM into your user directory. If youre using sudo, youre installing rails gem into your system-wide ruby.
So check that youre using the right ruby version by doing 'rvm info' and then do your 'gem install rails --version 3.0.3' without sudo
来源：https://stackoverflow.com/questions/4824139/every-time-i-close-terminal-rails-defaults-back-to-2-3-5-from-3-0-3