tethys.backend/app/Models/Person.ts

import {
	column,
	BaseModel,
	SnakeCaseNamingStrategy,
	computed,
	manyToMany,
	ManyToMany,
} from '@ioc:Adonis/Lucid/Orm';
import { DateTime } from 'luxon';
import dayjs from 'dayjs';
import Dataset from './Dataset';

export default class Person extends BaseModel {
	public static namingStrategy = new SnakeCaseNamingStrategy();
	public static primaryKey = 'id';
	public static table = 'persons';
	public static selfAssignPrimaryKey = false;

	@column({
		isPrimary: true,
	})
	public id: number;

	@column({})
	public academicTitle: string;

	@column()
	public email: string;

	@column({})
	public firstName: string;

	@column({})
	public lastName: string;

	@column({})
	public identifierOrcid: string;

	@column({})
	public status: boolean;

	@column({})
	public nameType: string;

	@column.dateTime({
		serialize: (value: Date | null) => {
			return value ? dayjs(value).format('MMMM D YYYY HH:mm a') : value;
		},
		autoCreate: true,
	})
	public registeredAt: DateTime;

	@computed({
        serializeAs: 'name'
    })
	public get fullName() {
		return this.firstName + ' ' + this.lastName;
	}

    @computed()
	public get progress(): number {
		return 50;
	}

    @computed()
	public get created_at() {
		return '2023-02-17 08:45:56';
	}

    @computed()
    public get datasetCount() {
      const stock = this.$extras.datasets_count //my pivot column name was "stock"
      return stock
      }

	@manyToMany(() => Dataset, {
		pivotForeignKey: 'person_id',
		pivotRelatedForeignKey: 'document_id',
		pivotTable: 'link_documents_persons',
        pivotColumns: ['role', 'sort_order', 'allow_email_contact']
	})
	public datasets: ManyToMany<typeof Dataset>;
}