Prisma-Knex

Using Prisma with Knex.js, A SQL Query Builder for Javascript for migrations.

Due to limitations with prisma introspect, we can only use PostgreSQL databases.

Prerequisites

• Knex.js (npm install knex / yarn add knex)
• Database
• docker-compose

Configuration

TODO: Add configrations for the databases, make sure that migrations is set to false in PRISMA_CONFIG

Creating migrations

First we will create a migration file with knex migrate:make

knex migrate:make --knexfile ./server/db create_user_table

This creates a migration to server/db/migrations, timestamped with the current date.

Next lets create some initial migration. You can use the knex query builder, but we'll use raw SQL for simplicity.

const up = knex =>
  knex.raw(`
    CREATE TABLE users (
      id serial primary key,
      username text unique,
      email text unique,
      first_name text,
      last_name text,
      created_at timestamp not null default now(),
      updated_at timestamp not null default now()
    )
  `);

const down = knex =>
  knex.raw(`
  DROP TABLE users;
`);

module.exports = {
  up,
  down,
};

Excellent! Now we can migrate to the latest migration we have, which is that one!

knex migrate:latest --knexfile=./server/db/knexfile.js

Introspection

Next we use prisma introspect to generate the datamodel based on the actual structure of the existing data on the PostgreSQL database.

WIP WIP