Ruby version must match what is in .ruby-version file

[StrangeWill]

Will have to look in to how Heroku uses this, it's pretty frustrating.

[t-richards]

@StrangeWill: When you specify ruby X.Y.Z in your Gemfile, Heroku will use that specific Ruby version while building/running your application. In this particular project the .ruby-version file contains the actual version number. This is nice because it allows you to do things like this:

$ echo "2.2.4" > .ruby-version
$ git update-index --assume-unchanged .ruby-version

Now you can use your desired version of Ruby without any issues (hopefully)!

[StrangeWill]

@t-richards Yeah if that's required then I'll drop it in the readme... I was just wondering if there was a less disruptive approach.

Like are there specific environment variables Heroku has that we can detect in the gem file? And only expose the Ruby version in that case?

It's pretty minor but the less work to get a pulled project working the better (IMO).

It's why I spun this up on my own Heroku instance, so I can play around and see what our options were if no one had an immediate suggestion.