Objection Js: Has One Relation (aka Many to one)

has-one-relation.js

const {
  Model
} = require('objection');
const Knex = require('knex');
const config = require('../config')
const Authority = require('./authority')

class Licence extends Model {
  static get tableName() {
    return 'licence';
  }

  static get relationMappings() {
    return {
      authority: {
        relation: Model.HasOneRelation,
        modelClass: Authority,
        join: {
          from: 'licence.authority_code',
          to: 'authority.code'
        }
      }
    }
  }
}

Licence.knex(Knex(config.databases.licence))

module.exports = Licence;