Daily Archives: 26 August 2013

rails `require’: cannot load such file — mysql2/mysql2 (LoadError)

Posted on by
Reply

Problem

You want to use a different ruby version from the one you have initially installed and build your application with, but when you change it in your rvm installation you get the following error:

..gems/mysql2-0.3.13/lib/mysql2.rb:8:in `require': cannot load such 
file -- mysql2/mysql2 (LoadError)

Solution

To make it work again you will have to uninstall the mysql2 gem and install it again in the new ruby version with the option –platform=ruby.

rvm use ruby-2.0.0-p247
cd my_project
rails s
..... gems/mysql2-0.3.13/lib/mysql2.rb:8:in `require': cannot load 
such file -- mysql2/mysql2 (LoadError)
gem uninstall mysql2
gem install mysql2 --platform=ruby
rails s
=> Booting WEBrick
....

RVM and RubyGems versions

Posted on by
Reply

Problem

You would like to upgrade your rubygems version from 1.8.17 to the latest version 2.0.7 for example.

Solution

You can upgrade to a specific or the latest gem version and relate that to a specific rvm ruby that you have installed.
So if for example you have ruby-1.9.3-p327 and ruby-2.0.0-p247, you can have different gem version (or the same if you want) for each ruby version.

To upgrade to the latest one in the ruby-2.0.0-p247 for example you could do the following:

rvm list
rvm use ruby-1.9.3-p327
gem -version
1.8.17
rvm use ruby-2.0.0-p247
gem --version
1.8.17
gem update --system
gem --version
2.0.7
rvm use ruby-1.9.3-p327
gem --version
1.8.17