Tutorial

Extending Medusa Example: Creating a Marketplace

Apr 18, 2023 by

Shahed Nasser

Learn how to create the foundation of your marketplace with Medusa

Medusa is the set of commerce building blocks that developers can use to create their custom use case. Instead of forcing developers to use a standardized solution, leading them to enforce hacky-workarounds, Medusa embraces customization and extendability.

This tutorial gives an example of Medusa's extensibility, showcasing how you can create a marketplace with our building blocks. While the steps in this tutorial may not lead to a fully-fledged marketplace, they will give you an idea of how it can be implemented by building the foundation. You’ll also find other resources at the end of the tutorial that can guide you through the rest of your marketplace development.

Last year, we wrote a blog about how to create a marketplace with Medusa and Medusa Extender. At the time, Medusa did not provide the necessary functionalities to extend its core, which required developers to use Medusa Extender. With the release of v1.8 of Medusa, the marketplace can now be built with Medusa only. This tutorial illustrates how to do that.

The code of this tutorial is available in this GitHub Repository.

What You’ll be Building

By following along the steps in this tutorial, you’ll be implementing the following logic:

Every time a user is created, a new store associated with that user is created.
When the user retrieves the store’s details, their store’s details will be retrieved.
Every time a product is created, it is associated with the store of the logged-in user.
The user will only be able to retrieve products from their store.

Prerequisites

This article assumes you already have a Medusa backend with v1.8 of Medusa installed. If not, you can learn how to install it here.

Extend the Store Entity

In this section, you’ll extend the Store entity so that you can later add new relations to it. Extending an entity requires extending its repository as well.

You can learn more about extending an entity in our documentation.

Create the file

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src/models/store.ts

with the following content:

import { Entity } from "typeorm"
import {
  Store as MedusaStore,
} from "@medusajs/medusa"

@Entity()
export class Store extends MedusaStore {
  // TODO add relations
}

This imports the

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Store

entity from the Medusa core package as

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MedusaStore

and creates a new

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Store

entity that extends it.

Extend the StoreRepository

Next, create the file

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src/repositories/store.ts

with the following content:

import { Store } from "../models/store"
import { 
  dataSource,
} from "@medusajs/medusa/dist/loaders/database"
import {
  StoreRepository as MedusaStoreRepository,
} from "@medusajs/medusa/dist/repositories/store"

export const StoreRepository = dataSource
  .getRepository(Store)
  .extend({
    ...Object.assign(
      MedusaStoreRepository, 
      { target: Store }
    ),
  })

export default StoreRepository

This imports the

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StoreRepository

from the Medusa core package as

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MedusaStoreRepository

, then extends the repository to target the new

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Store

entity you created.

Create index.d.ts

Finally, to ensure TypeScript is aware of the new type you’re creating, create the file

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src/index.d.ts

with the following content:

export declare module "@medusajs/medusa/dist/models/store" {
  declare interface Store {
    // TODO add relations
  }
}

You’ll later add relations to the

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Store

interface as you add them to the

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Store

entity. You’ll also be using the same file when extending other entities.

Extend the User Entity

Next, you’ll extend the user entity to add a new column and relation to the

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Store

entity. The steps are the same as the ones described in the previous section.

Start by creating the

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src/models/user.ts

file with the following content:

import { Column, Entity, Index, JoinColumn, ManyToOne } from "typeorm"
import {
  User as MedusaUser,
} from "@medusajs/medusa"
import { Store } from "./store";

@Entity()
export class User extends MedusaUser {
  @Index("UserStoreId")
  @Column({ nullable: true })
  store_id?: string;

  @ManyToOne(() => Store, (store) => store.members)
  @JoinColumn({ name: 'store_id', referencedColumnName: 'id' })
  store?: Store;
}

This imports the

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User

entity from the Medusa core package as

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MedusaUser

and creates a new entity

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User

that extends it. In the entity, you add a new column

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store_id

and a relation

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store

to the

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Store

entity.

Then, in the

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Store

entity created in

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src/models/store.ts

, add the following relation to the entity:

import { Entity, OneToMany } from "typeorm"
import { User } from "./user";
// other imports...

@Entity()
export class Store extends MedusaStore {
    @OneToMany(() => User, (user) => user?.store)
  members?: User[];
}

You might see some TypeScript errors in your editor now. This can be resolved by replacing the content of the

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src/index.d.ts

with the following content:

export declare module "@medusajs/medusa/dist/models/store" {
  declare interface Store {
    members?: User[];
  }
}

export declare module "@medusajs/medusa/dist/models/user" {
  declare interface User {
    store_id?: string;
    store?: Store;
  }
}

This informs TypeScript that the

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User

entity now has

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store_id

and

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store

properties, and the

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Store

entity has a

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members

property. You can learn more here.

Extend the UserRepository

Next, create the file

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src/repositories/user.ts

with the following content:

import { User } from "../models/user"
import { 
  dataSource,
} from "@medusajs/medusa/dist/loaders/database"
import {
  UserRepository as MedusaUserRepository,
} from "@medusajs/medusa/dist/repositories/user"

export const UserRepository = dataSource
  .getRepository(User)
  .extend({
    ...Object.assign(
      MedusaUserRepository, 
      { target: User }
    ),
  })

export default UserRepository

This imports the

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UserRepository

from the Medusa core package as

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MedusaUserRepository

and creates a new

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UserRepository

that extends it but targets the new

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User

entity.

Create Migration for the User Entity

Since you’re adding a new column

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store_id

to the

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User

entity, you must add a new migration that reflects that column in your database.

You can learn more about migrations in our documentation.

First, run the following command in the root directory of your backend:

npx typeorm migration:create src/migrations/add-user-store-id

This will create a new file under

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src/migrations

. The file’s name should be of the format

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<TIMESTAMP>_UserChanged.ts

In the file, there’s a migration class with two methods:

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up

and

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down

. Replace the methods with the following content:

public async up(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query(`ALTER TABLE "user" ADD "store_id" character varying`);
    await queryRunner.query(`CREATE INDEX "UserStoreId" ON "user" ("store_id") `);
}

public async down(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query(`DROP INDEX "public"."UserStoreId"`);
    await queryRunner.query(`ALTER TABLE "user" DROP COLUMN "store_id"`);
}

Before you run the migrations, run the

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build

command which transpiles the files under the

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src

directory into the

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dist

directory:

npm run build

Then, run the migration command:

medusa migrations run

This will add the new

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store_id

column to the

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user

table.

Create Middleware to Register Logged-In User

To get access to the logged-in user across your services, you need to register it through a middleware. This middleware will run on all endpoints under the

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/admin

path, except for the

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/admin/auth

endpoints.

You can learn more about middlewares in our documentation.

Start by creating the file

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src/api/middlewares/logged-in-user.ts

with the following content:

import { UserService } from "@medusajs/medusa"
import { User } from "../../models/user"

export async function registerLoggedInUser(req, res, next) {
  let loggedInUser: User | null = null

  if (req.user && req.user.userId) {
    const userService = 
      req.scope.resolve("userService") as UserService
    loggedInUser = await userService.retrieve(req.user.userId)
  }

  req.scope.register({
    loggedInUser: {
      resolve: () => loggedInUser,
     },
   })
  
  next()
}

This retrieves the logged-in user from

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req.user.userId

and, if available, registers it in Medusa’s dependency container under

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loggedInUser

You can learn more about the dependency container and injection in our documentation.

Next, create the file

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src/api/index.ts

with the following content:

import { Router } from "express"
import configLoader from "@medusajs/medusa/dist/loaders/config"
import { 
  registerLoggedInUser,
} from "./middlewares/logged-in-user"
import 
  authenticate 
from "@medusajs/medusa/dist/api/middlewares/authenticate"
import * as cors from "cors"

export default function (rootDirectory: string) {
  const router = Router()
  const config = configLoader(rootDirectory)

  const adminCors = {
    origin: config.projectConfig.admin_cors.split(","),
    credentials: true,
  }

  router.use(
    /\/admin\/[^(auth)].*/,
    cors(adminCors),
    authenticate(),
    registerLoggedInUser
  )

  return router
}

This registers the middleware on all paths starting with

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/admin

except for

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/admin/auth

paths. Notice that you also add the

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authenticate

middleware before the

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registerLoggedInUser

middleware. The

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authenticate

middleware authenticates the user and sets

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req.user

. If not added, the

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registerLoggedInUser

middleware will not be able to access the logged-in user.

You’ll see the middleware’s work in action when you start customizing services in the upcoming sections.

Extend Store Service

In this section, you’ll extend the

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Store

service to change the logic behind retrieving a store. In the Medusa core package, it’s assumed there’s one store and so the first store is retrieved. You’ll be changing that to retrieve the store of the logged-in user.

You can learn more about extending services in the documentation.

Create the file

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src/services/store.ts

with the following content:

import { Lifetime } from "awilix"
import { 
  FindConfig,
  StoreService as MedusaStoreService, Store, User,
} from "@medusajs/medusa"

class StoreService extends MedusaStoreService {
  static LIFE_TIME = Lifetime.SCOPED
  protected readonly loggedInUser_: User | null

  constructor(container, options) {
    // @ts-expect-error prefer-rest-params
    super(...arguments)

    try {
      this.loggedInUser_ = container.loggedInUser
    } catch (e) {
      // avoid errors when backend first runs
    }
  }

  async retrieve(config?: FindConfig<Store>): Promise<Store> {
    if (!this.loggedInUser_) {
      return super.retrieve(config);
    }

    return this.retrieveForLoggedInUser(config);
  }

  async retrieveForLoggedInUser (config?: FindConfig<Store>) {
    const storeRepo = this.manager_.withRepository(this.storeRepository_);
    const store = await storeRepo.findOne({
        ...config,
        relations: [
          ...config.relations,
          'members'
        ],
        where: {
          id: this.loggedInUser_.store_id
        },
    });

    if (!store) {
        throw new Error('Unable to find the user store');
    }

    return store
  }
}

export default StoreService

You import the

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StoreService

from the Medusa core package as

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MedusaStoreService

. You then create a new

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StoreService

class that extends

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MedusaStoreService

In the class, you set the

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LIFE_TIME

of the service to

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Lifetime.SCOPED

. This is necessary for the service to access the registered

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loggedInUser

. You can learn more about it in the documentation.

You also add a new class attribute

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loggedInUser_

and set its value in the constructor. Notice that you wrap the initialization of

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loggedInUser_

in the constructor with a try-catch block to avoid errors when the

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loggedInUser

is not registered in the Medusa container.

You then override the

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retrieve

method. In that method:

You check if the
```
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loggedInUser_
```
is set. If not, you call the
```
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retrieve
```
method of the service from the core package.

If the

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loggedInUser_

is set, you retrieve the store using a new method

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retrieveForLoggedInUser

. This method retrieves the store using the value of

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store_id

of the

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loggedInUser_

and expands the

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members

relation.

Before you test out this method, you should create the logic that associate a new user with a new store.

Extend the User Service

In this section, you’ll implement the logic behind creating a store for every new user. To do this, you’ll extend the

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UserService

from the Medusa core to override the

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create

method.

Create the file

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src/services/user.ts

with the following content:

import { Lifetime } from "awilix"
import { UserService as MedusaUserService } from "@medusajs/medusa"
import { User } from "../models/user"
import { CreateUserInput as MedusaCreateUserInput } from "@medusajs/medusa/dist/types/user"
import StoreRepository from "../repositories/store"

type CreateUserInput = {
  store_id?: string
} & MedusaCreateUserInput

class UserService extends MedusaUserService {
  static LIFE_TIME = Lifetime.SCOPED
  protected readonly loggedInUser_: User | null
  protected readonly storeRepository_: typeof StoreRepository;

  constructor(container, options) {
    // @ts-expect-error prefer-rest-params
    super(...arguments)
    this.storeRepository_ = container.storeRepository

    try {
      this.loggedInUser_ = container.loggedInUser
    } catch (e) {
      // avoid errors when backend first runs
    }
  }

  async create(user: CreateUserInput, password: string): Promise<User> {
    if (!user.store_id) {
      const storeRepo = this.manager_.withRepository(this.storeRepository_)
      let newStore = storeRepo.create()
      newStore = await storeRepo.save(newStore)
      user.store_id = newStore.id
    }

    return await super.create(user, password)
  }
}

export default UserService

In this file you:

Extend the core’s

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UserService

which is imported as

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MedusaUserService

You change the value of the
```
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LIFE_TIME
```
attribute of the service. This is explained in the Extend Store Service section.
You add a new
```
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loggedInUser_
```
attribute and initialize it in the constructor.
You override the
```
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create
```
method. In the method, you first check if the
```
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user
```
does not have a
```
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store_id
```
. This allows you to specifically set the store of the user in other places if necessary. This can be helpful if you’re creating a team of users in one store. If the user doesn’t have
```
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store_id
```
set, a new store is created and the
```
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store_id
```
property of the user is set to the ID of the new store. The user is saved then using the logic implemented in the core service.

Test Store-User Relation

Time to test everything you’ve implemented so far. To do that, run the

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build

and the

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start

commands in your Medusa backend:

npm run build && npm start

Once your Medusa backend starts, login with any admin user that you have using the User Login endpoint. If you’ve seeded your database with demo data, you should have the following login credentials:

{
    "email": "admin@medusa-test.com",
    "password": "supersecret"
}

Notice that when you log in, the

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store_id

of the user is set to

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null

Then, try to get the store’s data using the Get Store Details endpoint. The default store will be returned, which has an empty

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members

array.

Next, try to create a new user using the Create a User endpoint. You should see that the new user has a set

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store_id

Now, try to login with your new user, then try to retrieve the store’s data using the Get Store Details endpoint as mentioned earlier. You’ll see now that a different store is retrieved than the first time. This is the store that was created for this new user. It also has the new user as part of its

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members

array.

The user-store relation is now established and ready for use. Next, you’ll be working on the product-store relation.

Extend the Product Entity

In this section, you’ll extend the

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Product

entity to add a new column and relation to the

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Store

. The process will be very similar to that of extending the

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User

entity.

Start by creating the file

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src/models/product.ts

with the following content:

import { Column, Entity, Index, JoinColumn, ManyToOne } from "typeorm"
import {
  Product as MedusaProduct,
} from "@medusajs/medusa"
import { Store } from "./store";

@Entity()
export class Product extends MedusaProduct {
  @Index("ProductStoreId")
  @Column({ nullable: true })
  store_id?: string;

  @ManyToOne(() => Store, (store) => store.products)
  @JoinColumn({ name: 'store_id', referencedColumnName: 'id' })
  store?: Store;
}

This imports the

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Product

entity from the Medusa core package as

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MedusaProduct

and creates a new entity

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Product

that extends it. In the entity, you add a new column

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store_id

and a relation

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store

to the

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Store

entity.

Then, in the

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Store

entity created in

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src/models/store.ts

, add the following relation to the entity:

import { Product } from "./product";
// other imports...

@Entity()
export class Store extends MedusaStore {
    // other relation...

    @OneToMany(() => Product, (product) => product?.store)
  products?: Product[];
}

You might see some TypeScript errors in your editor now. This can be resolved by adding the

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products

relation to the

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Store

interface and adding a new declaration for the

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Product

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index.d.ts

export declare module "@medusajs/medusa/dist/models/store" {
  declare interface Store {
    members?: User[];
    products?: Product[];
  }
}

// user declaration...

export declare module "@medusajs/medusa/dist/models/product" {
  declare interface Product {
    store_id?: string;
    store?: Store;
  }
}

Extend the ProductRepository

Next, create the file

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src/repositories/product.ts

with the following content:

import { Product } from "../models/product"
import { 
  dataSource,
} from "@medusajs/medusa/dist/loaders/database"
import {
  ProductRepository as MedusaProductRepository,
} from "@medusajs/medusa/dist/repositories/product"

export const ProductRepository = dataSource
  .getRepository(Product)
  .extend({
    ...Object.assign(
      MedusaProductRepository, 
      { target: Product }
    ),
  })

export default ProductRepository

This imports the

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ProductRepository

from the Medusa core package as

Copy to clipboard
MedusaProductRepository

and creates a new

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ProductRepository

that extends it but targets the new

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Product

entity.

Create Migration for the Product Entity

Since you’re adding a new column

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store_id

to the

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Product

entity, you must add a new migration that reflects that column in your database.

First, run the following command in the root directory of your backend:

npx typeorm migration:create src/migrations/ProductChanged

This will create a new file under

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src/migrations

. The file’s name should be of the format

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<TIMESTAMP>_ProductChanged.ts

In the file, there’s a migration class with two methods:

Copy to clipboard
up

and

Copy to clipboard
down

. Replace the methods with the following content:

public async up(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query(`ALTER TABLE "product" ADD "store_id" character varying`);
    await queryRunner.query(`CREATE INDEX "ProductStoreId" ON "product" ("store_id") `);
}

public async down(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query(`DROP INDEX "public"."ProductStoreId"`);
    await queryRunner.query(`ALTER TABLE "product" DROP COLUMN "store_id"`);
}

Before you run the migrations, run the

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build

command which transpiles the files under the

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src

directory into the

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dist

directory:

npm run build

Then, run the migration command:

medusa migrations run

This will add the new

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store_id

column to the

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product

table.

Extend the Product Service

In this section, you’ll extend the product service to do two things:

Change the
```
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save
```
logic to attach the product to the logged-in user’s store.
Change the methods used to retrieve products including the
```
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list
```
,
```
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listAndCount
```
, and
```
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retrieve
```
methods to retrieve the products only associated with the logged-in user’s store.

Create the file

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src/services/product.ts

with the following content:

import { Lifetime } from "awilix"
import { 
  ProductService as MedusaProductService, Product, User,
} from "@medusajs/medusa"
import { CreateProductInput as MedusaCreateProductInput, FindProductConfig, ProductSelector as MedusaProductSelector } from "@medusajs/medusa/dist/types/product"

type ProductSelector = {
  store_id?: string
} & MedusaProductSelector

type CreateProductInput = {
  store_id?: string
} & MedusaCreateProductInput

class ProductService extends MedusaProductService {
  static LIFE_TIME = Lifetime.SCOPED
  protected readonly loggedInUser_: User | null

  constructor(container, options) {
    // @ts-expect-error prefer-rest-params
    super(...arguments)

    try {
      this.loggedInUser_ = container.loggedInUser
    } catch (e) {
      // avoid errors when backend first runs
    }
  }

  async list(selector: ProductSelector, config?: FindProductConfig): Promise<Product[]> {
    if (!selector.store_id && this.loggedInUser_?.store_id) {
      selector.store_id = this.loggedInUser_.store_id
    }

    config.select?.push('store_id')

    config.relations?.push('store')

    return await super.list(selector, config)
  }

  async listAndCount(selector: ProductSelector, config?: FindProductConfig): Promise<[Product[], number]> {
    if (!selector.store_id && this.loggedInUser_?.store_id) {
      selector.store_id = this.loggedInUser_.store_id
    }

    config.select?.push('store_id')

    config.relations?.push('store')

    return await super.listAndCount(selector, config)
  }

  async retrieve(productId: string, config?: FindProductConfig): Promise<Product> {
    config.relations = [
      ...(config.relations || []),
      'store'
    ]

    const product = await super.retrieve(productId, config);

    if (product.store?.id && this.loggedInUser_?.store_id && product.store.id !== this.loggedInUser_.store_id) {
      // Throw error if you don't want a product to be accessible to other stores
      throw new Error('Product does not exist in store.');
    }

    return product
  }

  async create(productObject: CreateProductInput): Promise<Product> {
    if (!productObject.store_id && this.loggedInUser_?.store_id) {
      productObject.store_id = this.loggedInUser_.store_id
    }

    return await super.create(productObject);
  }
}

export default ProductService

In this file you:

Extend the core’s

Copy to clipboard
ProductService

which is imported as

Copy to clipboard
MedusaProductService

You change the value of the
```
Copy to clipboard
LIFE_TIME
```
attribute of the service. This is explained in the Extend Store Service section.
You add a new
```
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loggedInUser_
```
attribute and initialize it in the constructor.
You override the
```
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list
```
and
```
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listAndCount
```
methods to filter the retrieved products by the logged-in user’s store ID. You also ensure that the
```
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store_id
```
attribute is retrieved as part of the product and that the
```
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store
```
relation is expanded.
You override the
```
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retrieve
```
method to check if the retrieved product belongs to the logged-in user’s store. If not, you throw an error that the product does not exist.
You override the
```
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create
```
method to check if the logged-in user has a store and, if so, associate the product’s store ID with that store.

Notice that you didn’t implement the
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save
mechanism as part of the repository this time. This is because the repository does not have access to the Medusa container. So, you won’t be able to access the logged-in user in it.

Test the Product-Store Relation

You can now test the relation between the product and the store.

Start by running the

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build

and

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start

commands in the root of your Medusa backend:

npm run build && npm start

Then, log in as a user who has a store as explained in the previous testing section.

After that, retrieve the available products by sending a request to the List Products endpoint. You’ll see that there are no products returned, even if you previously had products in your store. This is because these products are not associated with the user’s store.

Then, try creating a new product using the Create Product endpoint. You’ll see that the created product has a

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store

attribute. The

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id

of that store is the same ID of the user’s store.

If you try retrieving the list of products again, you’ll find your newly-created product in the returned array.

Note About Super-Admin User

So far in your implementation you’ve taken into accoun utsers that don’t have a set store ID. These are considered “super-admin” users. These users would be able to view all products in the store and the default store’s details.

If this logic does not work for you, make sure to change the implementation to require a store ID for a user in the different locations we’ve used it.

What’s Next

In this tutorial, you learned how to implement the foundation of a marketplace: having multiple stores, different users within those stores, and associating products with a store.

A marketplace has a variety of other features, each depending on your use case. Some of them are:

Create order-store relation: This requires a similar implementation as what you’ve done in this tutorial with products and users. You need to extend the
```
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Order
```
entity to include a relation to the store. You can learn more about extending entities in the documentation.
List orders by stores: This requires a similar implementation as what you’ve done in this tutorial with products. You need to extend the
```
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OrderService
```
to override the methods used to retrieve orders. You can learn more about extending services in the documentation.
Associate an order to a store: This requires listening to the
```
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order.created
```
event in a subscriber. The implementation can include creating child orders of an order if in your use case you support have products from multiple stores in one product. In this case, you’d also need to extend the order entity to create a parent-child relation. You can learn more about subscribers in the documentation.
Implement teams within a store: You can implement a team within a store by extending the
```
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Invite
```
entity to associate it with a store ID, then associate the user created from the invite with that store ID.

These are just some ideas and direction for your development of the marketplace. For further help in your development, make sure to check out the available guides in our documentation.

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