New Rails applications are predominantly created using the rails CLI, and users learn to interact with their data here also via rails dbconsole.

MongoDB does not have an ActiveRecord adapter, and as such cannot (and should not) be included out-of-the-box. Though workloads should realistically be tuned to the underlying database, ActiveRecord adapters are mostly "interchangeable" in that you can use the same rake tasks to setup a new database, run migrations, alter the schema and connect to the dbconsole.

To ensure MongoDB has a similarly smooth first-touch experience, additional tooling will need to be developed to facilitate new user onboarding and automation/generation of rails-specific MongoDB content and components.