tethys.backend/app/Models/UserRole.ts

import { column, BaseModel, belongsTo, BelongsTo, SnakeCaseNamingStrategy } from '@ioc:Adonis/Lucid/Orm';

import User from 'App/Models/User';
import Role from 'App/Models/Role';
import { DateTime } from 'luxon';
// import moment from 'moment'

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

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

    @column({})
    public user_id: number;

    @column({})
    public role_id: number;

    @column({
        // serialize: (value: DateTime | null) => {
        //   return value ? moment(value).format('lll') : value
        // },
    })
    public created_at: DateTime;

    @column({
        // serialize: (value: DateTime | null) => {
        //   return value ? moment(value).format('lll') : value
        // },
    })
    public updated_at: DateTime;

    public static boot() {
        super.boot();

        this.before('create', async (_modelInstance) => {
            _modelInstance.created_at = this.formatDateTime(_modelInstance.created_at);
            _modelInstance.updated_at = this.formatDateTime(_modelInstance.updated_at);
        });
        this.before('update', async (_modelInstance) => {
            _modelInstance.created_at = this.formatDateTime(_modelInstance.created_at);
            _modelInstance.updated_at = this.formatDateTime(_modelInstance.updated_at);
        });
    }

    private static formatDateTime(datetime) {
        let value = new Date(datetime);
        return datetime
            ? value.getFullYear() +
                  '-' +
                  (value.getMonth() + 1) +
                  '-' +
                  value.getDate() +
                  ' ' +
                  value.getHours() +
                  ':' +
                  value.getMinutes() +
                  ':' +
                  value.getSeconds()
            : datetime;
    }

    @belongsTo(() => User)
    public user: BelongsTo<typeof User>;

    @belongsTo(() => Role)
    public role: BelongsTo<typeof Role>;
}