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Information for rspec-rails developers

rspec-rails lives in a complicated ecosystem. We need to run it against multiple versions of rails and multiple versions of Ruby as well. There are several tools already available to manage running against multiple versions of Ruby (e.g. rvm), and there are even some multi-rails tools (e.g. multi-rails) but we haven't found one that does exactly what we need here, so we've rolled our own.

The short version

gem install thor bundler
thor version:use 3.1.3

The long version

thor version:use

The thor version:use task accepts any released version of rails, or either the 3-0-stable or master branches.

thor version:use master
thor version:use 3-0-stable
thor version:use 3-1-stable
thor version:use 3.1.3 # or any release >= 3.0.0

It then does a few things:

  • generates a .rails-version file with the version listed. This is used internally by assorted rake tasks.
  • installs the bundle
    • this includes binstubs, which are stored in ./bin

At any time, if you want to change rails versions, run thor version:use with a new version number. To play it safe, you probably want to also run rake clobber to delete all the code generated by the previous rails version.