In Ruby it’s “require” rather than “import.” But it would be more like “require bar; foo()”.
However, Ruby does have auto-loading conventions. So you could define “module Baz{ module Bar { def foo end; } }” in “baz/bar.rb” from the root of your project. You should then be able to call “Baz::Bar::foo()” from any other file in your project structure without a “require” at all. This is not standard Ruby IIRC, but Rails and other frameworks use it.
However, Ruby does have auto-loading conventions. So you could define “module Baz{ module Bar { def foo end; } }” in “baz/bar.rb” from the root of your project. You should then be able to call “Baz::Bar::foo()” from any other file in your project structure without a “require” at all. This is not standard Ruby IIRC, but Rails and other frameworks use it.