Defining relations results to error when the Mapper recordClass is set to false (POJO)

[XT-Martinez]

Description

I'm implementing a Data Mapper Pattern structure for my project and would like to use POJOs instead of Record instances when dealing with data from a REST API.
However, defining relations results to error when the recordClass in the mapper is set to false (POJO).
I'm not encountering an error if the recordClass is not set.

Environment

• js-data version: 3.0.8
• node or browser version: Google Chrome Version 83.0.4103.106
• operating system: Fedora 32 Silverblue

Steps to reproduce

1. Use the code below.

import { DataStore } from "js-data";
import { HttpAdapter } from "js-data-http";

const BASE_PATH = "http://localhost:3000/api";
const Store = new DataStore();
const Adapter = new HttpAdapter({ basePath: BASE_PATH });

Store.registerAdapter("http", Adapter, { default: true });

Store.defineMapper("ProductVariation", {
  endpoint: "productVariation",
  schema: {
    type: "object",
    properties: {
      id: { type: "number" },
      productId: { type: "number", indexed: true },
      name: { type: "string" },
    },
  },
  relations: {
    belongsTo: {
      Product: {
        foreignKey: "productId",
        localField: "product",
      },
    },
  },
  recordClass: false,
});

Store.defineMapper("Product", {
  endpoint: "product",
  schema: {
    type: "object",
    properties: {
      id: { type: "number" },
      name: { type: "string" },
      description: { type: "string" },
      isActive: { type: "boolean" },
    },
  },
  relations: {
    hasMany: {
      ProductVariation: {
        foreignKey: "productId",
        localField: "variations",
      },
    },
  },
  recordClass: false,
});

2. When executed, error encountered

DataStore.js:167 Uncaught TypeError: Cannot convert undefined or null to object
    at Function.getOwnPropertyDescriptor (<anonymous>)
    at DataStore.js:167

[crobinson42]

I would appreciate some help on this if you have time.

What I have done in my projects is a custom toJSON method because we rely on the Record Schema classes.

[yetrun]

@crobinson42 So how to solve it anyway?