# Custom models (Prisma ORM v6) (/docs/orm/v6/prisma-client/queries/custom-models)

This page explains how to wrap Prisma Client in custom models

Location: ORM > v6 > Prisma Client > Queries > Custom models

As your application grows, you may find the need to group related logic together. We suggest either:

- Creating static methods using a [Prisma Client extension](/guides/prisma-client-v6-client-extensions)
- Wrapping a model in a class
- Extending Prisma Client model object

## Static methods with Prisma Client extensions

The following example demonstrates how to create a Prisma Client extension that adds a `signUp` and `findManyByDomain` methods to a User model.

#### Prisma Client extension

```tsx
import bcrypt from "bcryptjs";
import { PrismaClient } from "../prisma/generated/client";

const prisma = new PrismaClient().$extends({
  model: {
    user: {
      async signUp(email: string, password: string) {
        const hash = await bcrypt.hash(password, 10);
        return prisma.user.create({
          data: {
            email,
            password: {
              create: {
                hash,
              },
            },
          },
        });
      },

      async findManyByDomain(domain: string) {
        return prisma.user.findMany({
          where: { email: { endsWith: `@${domain}` } },
        });
      },
    },
  },
});

async function main() {
  // Example usage
  await prisma.user.signUp("user2@example2.com", "s3cret");

  await prisma.user.findManyByDomain("example2.com");
}
```

#### Prisma schema

```prisma title="prisma/schema.prisma" copy 
datasource db {
  provider = "postgresql"
}

generator client {
  provider = "prisma-client"
  output   = "./generated"
}

model User {
  id       String    @id @default(cuid())
  email    String
  password Password?
}

model Password {
  hash   String
  user   User   @relation(fields: [userId], references: [id], onDelete: Cascade)
  userId String @unique
}
```

## Wrap a model in a class

In the example below, you'll see how you can wrap the `user` model in the Prisma Client within a `Users` class.

```tsx
import { PrismaClient, User } from "@prisma/client";

type Signup = {
  email: string;
  firstName: string;
  lastName: string;
};

class Users {
  constructor(private readonly prismaUser: PrismaClient["user"]) {}

  // Signup a new user
  async signup(data: Signup): Promise<User> {
    // do some custom validation...
    return this.prismaUser.create({ data });
  }
}

async function main() {
  const prisma = new PrismaClient();
  const users = new Users(prisma.user);
  const user = await users.signup({
    email: "alice@prisma.io",
    firstName: "Alice",
    lastName: "Prisma",
  });
}
```

With this new `Users` class, you can define custom functions like `signup`:

Note that in the example above, you're only exposing a `signup` method from Prisma Client. The Prisma Client is hidden within the `Users` class, so you're no longer be able to call methods like `findMany` and `upsert`.

This approach works well when you have a large application and you want to intentionally limit what your models can do.

## Extending Prisma Client model object

If you want to group custom functions together without hiding existing functionality, use `Object.assign` to extend Prisma Client:

```tsx
import { PrismaClient, User } from "@prisma/client";

type Signup = {
  email: string;
  firstName: string;
  lastName: string;
};

function Users(prismaUser: PrismaClient["user"]) {
  return Object.assign(prismaUser, {
    /**
     * Signup the first user and create a new team of one. Return the User with
     * a full name and without a password
     */
    async signup(data: Signup): Promise<User> {
      return prismaUser.create({ data });
    },
  });
}

async function main() {
  const prisma = new PrismaClient();
  const users = Users(prisma.user);
  const user = await users.signup({
    email: "alice@prisma.io",
    firstName: "Alice",
    lastName: "Prisma",
  });
  const numUsers = await users.count();
  console.log(user, numUsers);
}
```

Now you can use your custom `signup` method alongside `count`, `updateMany`, `groupBy()` and the other methods that Prisma Client provides, and the result stays type-safe.

## Going further

We recommend using [Prisma Client extensions](/guides/prisma-client-v6-client-extensions) to extend your models with [custom model methods](https://github.com/prisma/prisma-client-extensions/tree/main/instance-methods).

## Related pages

- [`Aggregation, grouping, and summarizing`](/guides/prisma-client-v6-queries-aggregation-grouping-summarizing): Use Prisma Client to aggregate, group by, count, and select distinct.
- [`Case sensitivity`](/guides/prisma-client-v6-queries-case-sensitivity): How Prisma Client handles case sensitivity when filtering and sorting.
- [`Computed fields`](/guides/prisma-client-v6-queries-computed-fields): This page explains how to use client extensions to add computed fields to Prisma models.
- [`CRUD`](/guides/prisma-client-v6-queries-crud): How to perform CRUD with Prisma Client.
- [`Custom validation`](/guides/prisma-client-v6-queries-custom-validation): This page explains how to add custom validation to Prisma Client

## Related pages

- [Authentication & Tools](./authentication-tools-index.md)
- [Build](./build-index.md)
- [Changelog](../changelog.md)
- [Concepts](./concepts-index.md)
- [Console commands](./console-commands-index.md)
- [Contract Authoring](./contract-authoring-index.md)
- [Core Concepts](./core-concepts-index.md)
- [Data Modeling](./data-modeling-index.md)
- [Database](./database-index.md)
- [DB commands](./db-commands-index.md)

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