lucid one to one code example

Example 1: adonis attach

const User = use('App/Models/User')
const Car = use('App/Models/Car')

const mercedes = await Car.findBy('reg_no', '39020103')
const user = await User.find(1)

await user.cars().attach([mercedes.id])

Example 2: adonis hasone

const Model = use('Model')

class User extends Model {
  profile () {
    return this.hasOne('App/Models/Profile')
  }
}

module.exports = User