MacOS Rails installation permissions

[taslater]

gem install rails permissions error:

➜  ~ gem install rails
ERROR:  While executing gem ... (Errno::EACCES)
    Permission denied @ rb_sysopen - /usr/local/lib/ruby/gems/3.1.0/gems/rails-7.0.2.3/README.md

It wanted me to run sudo gem install rails but that sounded like a bad idea.

My solution:

I installed the Frum Ruby version manager. These instructions were helpful.

Switching global Ruby from the Homebrew installation to the Frum installation using frum global 3.1.1 (or whatever is the latest Ruby version) allowed me to use gem install rails without sudo.