What could be the reason for TypeScript throwing an error that 'product' does not exist in type '{...}' even though 'product' is present?

Structure of Prisma Models:

model Product {
  id          String @id @default(auto()) @map("_id") @db.ObjectId
  name        String
  description String
  price       Float
  image       String

  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  cart Cart[]
}

model Cart {
  id String @id @default(auto()) @map("_id") @db.ObjectId

  userId String @db.ObjectId
  user   User   @relation(fields: [userId], references: [id])

  productId String  @db.ObjectId
  product   Product @relation(fields: [productId], references: [id])

  quantity  Int      @default(1)
  dateAdded DateTime @default(now())
}

Snippet of Code for CartItem Component:

import { Cart } from "@prisma/client";

const CartItem = ({ cartItem }: { cartItem: Cart }) => {

  const { image, name, description, price } = cartItem.product;
  return (...)
}

Error thrown regarding cartItem.product:

The error message states: 'Property 'product' does not exist on type '{ id: string; userId: string; productId: string; quantity: number; dateAdded: Date; }'. Did you mean 'productId'?ts(2551) index.d.ts(4545, 7): 'productId' is declared here.

Given that the model clearly defines the existence of the 'product' attribute, why does the error occur?

Answer №1

When working with Prisma and defining relations between models, it's important to note that the generated types may not automatically include related fields. To access this data, you can employ eager loading or lazy loading.

If you encounter this issue, you can adjust the query fetching Cart items to also retrieve associated Product information. Here's an example using eager loading in Prisma:

Follow this approach :-

import { PrismaClient } from '@prisma/client';

const prisma = new PrismaClient();

async function getCartItemsWithProducts() {
  const cartItems = await prisma.cart.findMany({
    include: {
      product: true, // This includes the related Product data
    },
  });
  return cartItems;
}

Don't forget to run npx prisma generate as well.

Once you've executed the command, TypeScript should recognize the product property within the Cart type.

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