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Mergin Maps Development guide

This page contains useful information for those who wish to develop Mergin.

Running locally (for dev)

Install dependencies and run services:

Postgres and Redis

$ docker run -d --rm --name mergin_maps_dev_db -p 5002:5432 -e POSTGRES_PASSWORD=postgres postgres:14
$ docker run -d --rm --name mergin_maps_dev_redis -p 6379:6379 redis

Server

$ pip3 install --upgrade pip==24.0
$ pip3 install pipenv==2024.0.1
$ cd server
# Install dependencies with pipenv
# Note: You can append --three flag in older versions of pipenv (< 3.16.8 2023-02-04)
$ pipenv install --dev
$ export FLASK_APP=application; export COLLECT_STATISTICS=0
$ pipenv run flask init-db
# create admin user
$ pipenv run flask user create admin topsecret --is-admin --email [email protected]
# create (non admin) user
$ pipenv run flask user create user topsecret --email [email protected]
$ pipenv run celery -A application.celery worker --loglevel=info &
$ pipenv run flask run # run dev server on port 5000

Web applications

Before installing the web applications, make sure you have Node.js installed in a supported version. The applications require Node.js version 18 or higher.

$ cd web-app
$ yarn install
$ yarn link:dependencies # link dependencies
$ yarn build:libs # bild libraries @mergin/lib @mergin/admin-lib @mergin/lib-vue2
$ yarn dev  # development client web application dev server on port 8080 (package @mergin/app)
$ yarn dev:admin  # development admin appplication dev server on port 8081 (package @mergin/admin-app)

If you are developing a library package (named *-lib), it is useful to watch the library for changes instead of rebuilding it each time.

To watch the @mergin/lib library while developing:

# watch:admin-lib, etc.
yarn watch:lib
# Also watch type definitions
yarn watch:lib:types

Watching the type definitions is also useful to pick up any changes to imports or new components that are added.

Running locally in a docker composition

# Run the docker composition with the current Dockerfiles
docker compose -f docker-compose.yml -f docker-compose.dev.yml up -d

# Give ownership of the ./projects folder to user that is running the gunicorn container
sudo chown 901:999 projects/

# init db and create user
docker exec -it merginmaps-server flask init-db
docker exec -it merginmaps-server flask user create admin topsecret --is-admin --email [email protected]

Running tests

To launch the unit tests run:

$ docker run -d --rm --name testing_pg -p 5435:5432 -e POSTGRES_PASSWORD=postgres postgres:14
$ cd server
$ pipenv install --dev --sequential --verbose
$ pipenv run pytest -v --cov=mergin mergin/tests