How do I specify to rails which version of ruby I would like to use?

Question

Before judging this question please listen to these details: I have tried twenty million things to "update" ruby so that it is compatible with ruby on rails. The problem is that I cannot make changes to anything in the bin of my macbook. The terminal simply does not allow it. So, I installed a new version of ruby via the command line that is 2.5.1. How do I direct rails via the terminal to use this version instead of the version in my bin?

Answer 1

From the official Rails Guides website.

• Rails 6 requires Ruby 2.4.1 or newer.
• Rails 5 requires Ruby 2.2.2 or newer.
• Rails 4 prefers Ruby 2.0 and requires 1.9.3 or newer.
• Rails 3.2.x is the last branch to support Ruby 1.8.7.
• Rails 3 and above require Ruby 1.8.7 or higher.

While Rails 6 is still unreleased, this is a preliminary guess, given from the current master-branch of the official repository, at https://github.com/rails/rails/blob/master/guides/source/upgrading_ruby_on_rails.md

From edge-guides:

• http://edgeguides.rubyonrails.org/upgrading_ruby_on_rails.html#ruby-versions