Prisma

Snappy loves Prisma

This example shows how to set up your Seed workflow with Prisma (opens in a new tab).

Prerequisites

Set up a new Prisma project by following the Prisma Quickstart (opens in a new tab) guide.

1. Install Seed

Set up Seed in your Prisma project by running the following command:

>_ terminal


npx @snaplet/seed init

2. Configure Seed

Using the previous command should have created a seed.config.ts configuration file.

You can use it as is, or customize it to fit your needs.

seed.config.ts


import { SeedPrisma } from "@snaplet/seed/adapter-prisma";
import { defineConfig } from "@snaplet/seed/config";
import { PrismaClient } from "@prisma/client";
export default defineConfig({
  adapter: () => {
    const client = new PrismaClient();
    return new SeedPrisma(client);
  },
  select: [
    "!*_prisma_migrations",
  ],
});

3. Customize the Seed Script

The npx @snaplet/seed init command should also have created a seed script example seed.mts.

You can move this file into your prisma directory and customize it to seed your database with the data you need.

prisma/seed.mts


import { createSeedClient } from "@snaplet/seed";
const seed = await createSeedClient();
// Truncate all tables in the database
await seed.$resetDatabase();
// Seed the database with 10 users
await seed.users((x) => x(10));
process.exit();

4. Hook into Prisma seeding workflow

You can hook into Prisma seeding workflow (opens in a new tab) by specifying a seed command in your package.json file:

package.json


"prisma": {
  "seed": "npx tsx prisma/seed.mts"
},

With this change, the database will be seeded with the data you specified in your seed.mts file for each of the following commands:

prisma db seed
prisma migrate dev
prisma migrate reset

5. Keep Seed Client in sync with your database

Whenever your database structure changes (e.g after a new migration is applied), @snaplet/seed will need be regenerated to reflect the new structure. To do this, run the following command:

>_ terminal


npx @snaplet/seed sync

If you want to automate this process, you can add a post script (opens in a new tab) to your package.json file:

package.json


"scripts": {
  "migrate": "prisma migrate dev",
  "postmigrate": "npx @snaplet/seed sync"
}

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