Prisma Schema File

Wasp uses Prisma to interact with the database. Prisma is a "Next-generation Node.js and TypeScript ORM" that provides a type-safe API for working with your database.

With Prisma, you define your application's data model in a schema.prisma file. Read more about how Wasp Entities relate to Prisma models on the Entities page.

In Wasp, the schema.prisma file is located in your project's root directory:

.
├── main.wasp
...
├── schema.prisma
├── src
├── tsconfig.json
└── vite.config.ts

Wasp uses the schema.prisma file to understand your app's data model and generate the necessary code to interact with the database.

Wasp file and Prisma schema file

Let's see how Wasp and Prisma files work together to define your application.

Here's an example schema.prisma file where we defined some database options and two models (User and Task) with a one-to-many relationship:

schema.prisma

datasource db {
  provider = "postgresql"
  url      = env("DATABASE_URL")
}

generator client {
  provider = "prisma-client-js"
}

model User {
  id      Int        @id @default(autoincrement())
  tasks   Task[]
}

model Task {
  id          Int        @id @default(autoincrement())
  description String
  isDone      Boolean    @default(false)
  user        User       @relation(fields: [userId], references: [id])
  userId      Int
}

Wasp reads this schema.prisma file and extracts the info about your database models and database config.

The datasource block defines which database you want to use (PostgreSQL in this case) and some other options.

The generator block defines how to generate the Prisma Client code that you can use in your application to interact with the database.

Relationship between Wasp file and Prisma file

Finally, Prisma models become Wasp Entities which can be then used in the main.wasp file:

main.wasp

app myApp {
  wasp: {
    version: "^0.15.0"
  },
  title: "My App",
}

...

// Using Wasp Entities in the Wasp file

query getTasks {
  fn: import { getTasks } from "@src/queries",
  entities: [Task]
}

job myJob {
  executor: PgBoss,
  perform: {
    fn: import { foo } from "@src/workers/bar"
  },
  entities: [Task],
}

api fooBar {
  fn: import { fooBar } from "@src/apis",
  entities: [Task],
  httpRoute: (GET, "/foo/bar/:email")
}

In the implementation of the getTasks query, Task is a Wasp Entity that corresponds to the Task model defined in the schema.prisma file.

The same goes for the myJob job and fooBar API, where Task is used as an Entity.

To learn more about the relationship between Wasp Entities and Prisma models, check out the Entities page.

Wasp-specific Prisma configuration

Wasp mostly lets you use the Prisma schema file as you would in any other JS/TS project. However, there are some Wasp-specific rules you need to follow.

The datasource block

schema.prisma

datasource db {
  provider = "postgresql"
  url      = env("DATABASE_URL")
}

Wasp takes the datasource you write and use it as-is.

There are some rules you need to follow:

• You can only use "postgresql" or "sqlite" as the provider because Wasp only supports PostgreSQL and SQLite databases for now.
• You must set the url field to env("DATABASE_URL") so that Wasp can work properly with your database.

The generator blocks

schema.prisma

generator client {
  provider = "prisma-client-js"
}

Wasp requires that there is a generator block with provider = "prisma-client-js" in the schema.prisma file.

You can add additional generators if you need them in your project.

The model blocks

schema.prisma

model User {
  id      Int        @id @default(autoincrement())
  tasks   Task[]
}

model Task {
  id          Int        @id @default(autoincrement())
  description String
  isDone      Boolean    @default(false)
  user        User       @relation(fields: [userId], references: [id])
  userId      Int
}

You can define your models in any way you like, if it's valid Prisma schema code, it will work with Wasp.

Triple slash comments

Wasp doesn't yet fully support /// comment syntax in the schema.prisma file. We are tracking it here, let us know if this is something you need.

Prisma preview features

Prisma is still in active development and some of its features are not yet stable. To enable various preview features in Prisma, you need to add the previewFeatures field to the generator block in the schema.prisma file.

For example, one useful Prisma preview feature is PostgreSQL extensions support, which allows you to use PostgreSQL extensions like pg_vector or pg_trgm in your database schema:

schema.prisma

datasource db {
  provider   = "postgresql"
  url        = env("DATABASE_URL")
  extensions = [pgvector(map: "vector")]
}

generator client {
  provider        = "prisma-client-js"
  previewFeatures = ["postgresqlExtensions"]
}

// ...

Read more about preview features in the Prisma docs here or about using PostgreSQL extensions here.