How to use different versions of Ruby and Rails for each project in RoR?

Question

Ruby on Rails

I started to learn RoR and a couple of questions arose. I have experience in PHP and Django. And in Django, you can use different versions of Python for each project, creating a separate environment. That is, by creating an environment, you can install a python of any version inside the environment and then run Django under this environment. In RoR on this part, I still do not understand at all. installed ruby ​​in Ubuntu, then rails and start creating projects by typing rails new project_name. If I need to run the project under a different version of rails, will I have to change the version in the system (in this case, there may be errors in existing versions due to version mismatch) or what? Please explain this point.

Answer 1

rbenv and rvm

Answer 2

1) Install RVM
2) Through RVM, install the ruby ​​versions that you need for projects
In the nginx + passenger bundle, in the nginx config, you can specify which version to use:

passenger_ruby /Users/your_user/.rvm/gems/ruby-2.3.0/wrappers/ruby;