A Ruby workflow with RVM and Bundler
Published 24 May 2012 under ruby, rvm, bundler, how to
Ruby has some great tools surrounding it which make it a pleasure to work with but getting everything setup can be tricky.
Bundler is an awesome tool which manages an
application's dependencies. It removes the problems of having to document which
RubyGems you need to install before you can get going on a project. Simple type
bundle install in a directory with a
Gemfile and the project's dependencies
will be installed.
RVM (Ruby version manager) provides a nice way to have
multiple rubies installed at once. It also releases you from the nightmare that
apt-get Ruby. There are a couple of things I really don't like
about setting up RVM but once set up it's wonderful.
To install RVM head over to their install
instructions and execute the first command and
make sure that the following or something similar is in your
[[ -s $HOME/.rvm/scripts/rvm ]] && source $HOME/.rvm/scripts/rvm
Before going onto install a Ruby it's probably worth installing a few rvm packages:
rvm pkg install zlib rvm pkg install readline
Once you've installed the packages you need, go ahead and install a Ruby:
rvm install 1.9.3
and use optionally make it the default:
rvm use 1.9.3 --default
One of RVM's killer features is gemsets. A gemset allows you to have an isolated set of gems. It's a really good idea to have a specific set of gems for each project, that way you can be sure which versions of the gems you're actually using and avoid any potential conflicts between versions.
Before installing any gems add the following two lines to your
save waiting around for rdoc and ri to install.
install: --no-ri --no-rdoc update: --no-ri --no-rdoc
When starting or after cloning a Ruby repo from git which uses Bundler create a gemset for the project. The convention I use is to give the gemset the same name as the project directory - that way it's easy to remember what it is. To create and use the gemset:
rvm gemset use <gemset name> --create
Each project should have its own Gemfile so install and run the Bundler gem inside our empty gemset:
gem install bundler bundle
To switch between gemsets use the following:
rvm gemset use <gemset name>
Manually switching between gemsets is time-consuming so we want to automate it.
RVM to the rescue! By putting a
.rvmrc file with the ruby and gemset version
in each project we can get RVM to automatically switch between gemsets when we
cd into the directory! For example the following will switch to Ruby 1.9.3 and
the my-project gemset:
To automate even further we can automatically create a
.rvmrc when we create
rvm gemset use <gemset name> --create --rvmrc
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