The db directory contains the code used for initializing the db + setting up migrations. That's where TypeORM's code such as createDatasource and migrations handling will go. This directory also contains index definitions for Mongo entities, but with TypeORM these definitions are annotations defined on the entity class.

In the entities directory, you will find one directory per entity and that's where you'll find the model definitions. For example, in the releases contains a file named release.ts at its root, which creates the Mongo model as export const Releases = () => AppDb.db.collection<Release>('releases');. This Releases model is "Mongo ORM" object used everywhere else in the project to manage releases from the db (created, read, update, delete...). This is the equivalent of your TypeORM "entity".

Other than that, most of the work required will be to translate the existing Mongo models into TypeORM definitions. Then, you'll need to update the deployment files (docker-compose etc). There's also the docs to update and explain to people how you would convert your existing deployment to the Postgres one. We'll need to write a migration tool to copy the data from Mongo to Postgres.

This is a global overview, the best option is to navigate the code and try developing locally.

Deploy Remix app with Prisma and Postgres #260

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