Ruby

What does Ruby do in a Rails app?

Ruby is the language used to write the code. Rails is a framework built for Ruby. In a Rails booking app, one part can handle a submitted time and another can describe how the reservation is saved.

How can you check one small Rails change?

Use an isolated copy with a separate test database and two made-up times. Confirm it cannot send real messages or take payments. If it asks for sign-in, verify it uses only test accounts before creating one.

1. 1
   Find the receiving code

   Ask the maintainer to show which part receives a time from the form and which part saves it.
2. 2
   Try a missing input

   Use the existing test harness to check that a missing required name leaves the sample list unchanged.
3. 3
   Save one fictional booking

   Use a made-up name, then reload and confirm that one record still shows the chosen time. The check tells you whether that flow still works after a dependency or version change.

Which Ruby version will a Rails app need on another host?

Check Ruby and Rails separately, along with any packages the app uses. Ruby’s upstream table lists 4.0 and 3.4 in normal maintenance, 3.3 in security maintenance and 3.2 at end of life.

Keep the dependency list and its lockfile. In a Bundler project they are usually Gemfile and Gemfile.lock. Test the target platform as well as the version. A package can have requirements for the machine it runs on.

What should you be able to restore besides the Ruby code?

Keep a way to restore the database and any uploaded files. Keep the release and access settings separate from a code copy. Try a restore into an isolated app and read one saved record before relying on it.

Ruby is open source. Budget separately for a host, a database and storage if the app uses them. Moving the project files gets the destination the code. It does not hand over those services or their data.