Nested types example

The introductory example features a standalone class. Let's look at a more involved example that builds on top of that:

  "givenName": "Javier",
  "familyName": "Cejudo",
  "pets": [
      "name": "Robbie"

Notice that the data contains a list of pets (Animal).

Again, our goal is to parse JSON into JavaScript classes to be able to do things like

const person1 = M.fromJSON(Person, personJson)

person1.fullName() // => 'Javier Cejudo'
person1.pets().get(0).speak() // => 'my name is Robbie!'

Note: pets() returns a Modelico.List, which has a get method, but little more. To map, filter or perform other operations, you will need to grab the underlying array with .inner(). See the proxies docs for a way to use methods and properties of the inner structure directly.

To achieve our goal, we need a Person that references Animal within its inner types using the M.metadata()._ function.

import M from 'modelico'

const {_, string, list} = M.metadata()

class Person extends M.Base {
  fullName () {
    return `${this.givenName()} ${this.familyName()}`.trim()

  static innerTypes () {
    return Object.freeze({
      givenName: string(),
      familyName: string(),
      pets: list(_(Animal))

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