Populate database in bootstrap.js

System Information
  • Strapi Version:
  • Operating System:
  • Database:
  • Node Version:
  • NPM Version:
  • Yarn Version:

I am trying to populate the database with a JSON file and following this tutorial: Import data from file | Strapi
It explains how you can add relational data without an example. I have categories in a separate collection, but struggling to source it as find is undefined.
Has anyone got an example I and others could use?
Or, tell me where I am going wrong?

const { offers } = require('../../data/offers.json');

module.exports = async() => {

  offers.forEach(offer => {

        const findCategoryItem = async (identifier) => {
            const result = await strapi
              .find({ id: identifier });
            return result;

         const offerCategory = findCategoryItem('604fa6eaa818b7e08079ee1a')


               offer_category: {Category: offerCategory.name}