How can I work with Nested Objects in Loopback 4 using the cli b4 model command

Question

I'm working with deep nested objects that I need to model for using lb4. Any chance I can get help with this sample JSON code?

{ "cardAcceptor": { "address": { "city": "Foster City", "country": "RU", "county": "San Mateo", "state": "CA", "zipCode": "94404" }, "idCode": "ABCD1234ABCD123", "name": "ABCD", "terminalId": "ABCD1234" }, "destinationCurrencyCode": "840", "markUpRate": "1", "retrievalReferenceNumber": "201010101031", "sourceAmount": "100", "sourceCurrencyCode": "643", "systemsTraceAuditNumber": "350421" }

Answer 1

You can create separate Models for the nested objects,

for example for above data structure

You can have something like

export class CardAcceptor extends Address {

  @property({
    type: 'string',
    required: true,
  })
  address: string;

  @property({
    type: 'string',
    required: true,
  })
  idCode: string

  @property({
    type: 'string',
    required: true,
  })
  name: string;

  @property({
    type: 'string',
    required: true,
  })
  terminalId: string;

  constructor(data?: Partial<CardAcceptor>) {
    super(data);
  }
}

export class Address extends Entity {

  @property({
    type: 'string',
    required: true,
  })
  city: string;

  @property({
    type: 'string',
    required: true,
  })
  country: string

  @property({
    type: 'string',
    required: true,
  })
  county: string;

  @property({
    type: 'string',
    required: true,
  })
  state: string;


  @property({
    type: 'boolean',
    required: true,
  })
  zipCode: boolean;

  constructor(data?: Partial<Address>) {
    super(data);
  }
}

export class BaseModel extends CardAcceptor {


  @property.array(CardAcceptor)
  cardAcceptor: CardAcceptor;

  @property({
    type: 'string',
    required: true,
  })
  destinationCurrencyCode: string;

  @property({
    type: 'string',
    required: true,
  })
  markUpRate: string

  @property({
    type: 'string',
    required: true,
  })
  retrievalReferenceNumber: string;

  @property({
    type: 'string',
    required: true,
  })
  sourceAmount: string;


  @property({
    type: 'boolean',
    required: true,
  })
  sourceCurrencyCode: boolean;

  @property({
    type: 'array',
    itemType: 'string',
    default: [],
  })
  systemsTraceAuditNumber?: string[];


  constructor(data?: Partial<Game>) {
    super(data);
  }
}

Hopefully, this helps. Thanks