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Prisma relations

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Prisma relations solve a huge problem with databases and data handling.

Suppose you have a list of users in your app, that create tweets (imagine Twitter).

In your schema you can define the relation between those 2 entities in this way:

model Tweet {
  id Int @id @default(autoincrement()) 
  text String
  author User @relation(fields: [authorId], references: [id])
  authorId Int

model User {
  id Int @default(autoincrement()) @id
  tweets Tweet[]

When you create a new tweet you associate it with a user with id 1 in this way:

await prisma.tweet.create({
  data: {
    text: req.body.content,
    author: {
      connect: { id: 1 }

Then you can retrieve the author information when you get one tweet, with:

await prisma.tweet.findMany({
  include: {
    author: true

You can also create a user and populate the database with 2 tweets associated to it:

await prisma.user.create({
  data: {
    tweets: {
      create: [
        { text: 'test' },
        { text: 'test2' },
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