nest-prisma-monorepo

Here is the POC of a monorepo built with nestjs and prisma used to expose several apps, relying on several databases.

                 

⚡ Requirements

You will need the following to use this POC :

Item	Description	Documentation
nodejs	Duh!	https://nodejs.org/en/
Docker	we will use docker to launch a postgres instance	https://www.docker.com/get-started
yarn	We will use yarn as the package manager for this project	https://yarnpkg.com/getting-started/install

⚡ How to start

🔶 Firstof, let's start our database using docker

You may need to give execution permission to the entry point script file, that is responsible for creating our three databases:

chmod +x docker/pg-init-scripts/create-multiple-db.sh

Let's then use docker compose :

yarn docker

🔶 Then we can migrate our schemas and seed the databases

yarn dev:db

🔶 Launching our backends in dev mode

# Hiking app (port 5001)
yarn dev hiking-app
# Projects app (port 5002)
yarn dev projects-app

🔶 Accessing apps swaggers

Now we can access the swaggers of our apps using the following urls:

• Hiking app
• Projects app

🔶 Building our apps for production

yarn build

⚡ Project structure

🎉 Apps

Database	Description
🚀 Hiking app	This kiking app allows users to check and join hiking groups planning to do a walk on some trail. This app owns a database but also uses the Users database.
🚀 Projects app	This projects app allows users to check contributions made to repositories. This app owns a database and also uses the Users database.

🧩 Libs

Database	Description
🧩 Boostraper	The code necessary to create an app is defined there and shared between apps.
🧩 Databases	The base prisma services are defined on this shared module.
🧩 Decorators	Decorators used in all our apps.
🧩 Filters	Filters used in all our apps.
🧩 Pipes	Pipes used in all our apps.
🧩 Rxjs	Rxjs helpers.
🧩 Tests	Test related code.

⚡ Data model

We have three databases:

Database	Description
👨 Users	Contains our users (duh). This database will serve as the single base of truth for everything user related in our apps.
🏔️ Hiking	Database dedicated to the hiking backend service.
🧳 Projects	Database dedicated to the projects backend service.

Let's take a look at the schema: