unleash.unleash/docs/developer-guide.md

id	title
developer_guide	Developer guide

PostgreSQL

To run and develop unleash, you need to have PostgreSQL database (PostgreSQL v10.x or newer) locally.

Unleash currently also work with PostgreSQL v9.5+, but this might change in a future feature relase, and we have stopped runnig automatic integration tests below PostgreSQL v10.

Create a local unleash databases in postgres

$ psql postgres <<SQL
CREATE USER unleash_user WITH PASSWORD 'passord';
CREATE DATABASE unleash;
GRANT ALL PRIVILEGES ON DATABASE unleash to unleash_user;
CREATE DATABASE unleash_test;
GRANT ALL PRIVILEGES ON DATABASE unleash_test to unleash_user;
SQL

Password is intentionally set to 'passord', which is the Norwegian word for password.

Then set env vars:

(Optional as unleash will assume these as default values).

export DATABASE_URL=postgres://unleash_user:passord@localhost:5432/unleash
export TEST_DATABASE_URL=postgres://unleash_user:passord@localhost:5432/unleash_test

PostgreSQL with docker

If you don't want to install PostgreSQL locally, you can spin up an Docker instance. We have created a script to ease this process: scripts/docker-postgres.sh

Commands

// Install dependencies
npm install

// Start server in development
npm start:dev

// Unleash UI
http://localhost:4242

// API:
http://localhost:4242/api/

// Execute tests in all packages:
npm test

Database changes

We use database migrations to track database changes.

Making a schema change

To run migrations, you will set the environment variable for DATABASE_URL

export DATABASE_URL=postgres://unleash_user:passord@localhost:5432/unleash

Use db-migrate to create new migrations file.

> npm run db-migrate -- create YOUR-MIGRATION-NAME

All migrations require one up and one down method.

Example of a typical migration:

/* eslint camelcase: "off" */
'use strict';

exports.up = function(db, cb) {
  db.createTable(
    'examples',
    {
      id: { type: 'int', primaryKey: true, notNull: true },
      created_at: { type: 'timestamp', defaultValue: 'now()' },
    },
    cb,
  );
};

exports.down = function(db, cb) {
  return db.dropTable('examples', cb);
};

Test your migrations:

> npm run db-migrate -- up
> npm run db-migrate -- down

Publishing / Releasing new packages

Please run npm run nsp and npm run test checks before publishing.

Run npm run publish to start the publishing process.

npm run publish:dry