Nested objects deserialization to a TypeScript Class

Question

I have a class, for example, let's say a Car with the below structure.

@Serializable()
export default class Car {
  @JsonProperty({
    name: 'id'
  })
  private id!: string;

  @JsonProperty({
    name: 'name'
  })
  private name!: string;

  @JsonProperty({
    name: 'carOwner'
  })
  private carOwner!: Owner;
}

Further I have the Owner class.

@Serializable()
export default class Owner{
  @JsonProperty({
    name: 'id'
  })
  private id!: string;

  @JsonProperty({
    name: 'name'
  })
  private name!: string;

  @JsonProperty({
    name: 'address'
  })
  private address!: string;
}

I have an incoming JSON Object with below structure, let's call it newCar

{
  "id": "test-id",
  "name": "test-car",
  "carOwner": {
    "id": "owner-id",
    "name": "owner-name",
    "address": "owner-address",
    "gender": "owner-gender",
    "age": "owner-age",
  }
}

What I want to do is, deserialize the newCar JSON to the Car class. That is when I deserialize newJson I should get the below object, where gender and age are filtered out.

{
  "id": "test-id",
  "name": "test-car",
  "carOwner": {
    "id": "owner-id",
    "name": "owner-name",
    "address": "owner-address"
  }
}

But right now what I am getting is the original newJson. It seems that the library (typescript-json-serializer) which I am using does not deserialize nested objects, here which is owner.

Any input will be appreciated.

Here is the link to the package typescript-json-serializer

Maybe this helps. github.com/GillianPerard/typescript-json-serializer/issues/82 Is Owner marked as Serializable? — tiriana
– tiriana, Commented Oct 21, 2021 at 12:44
@tiriana Yes, Owner is marked Serializable. Apologies that I didn't mention it in code. I'll edit. — MuzaffarShaikh
– MuzaffarShaikh, Commented Oct 21, 2021 at 12:47
No worries. And when you deserialize - do you pass the Car class as second argument? typescriptJsonSerializer.deserialize(newCar, Car); — tiriana
– tiriana, Commented Oct 21, 2021 at 12:55
@tiriana I found the solution for it. Apparently I missed to pass the type Owner inside the JsonProperty() for owner in Car class. — MuzaffarShaikh
– MuzaffarShaikh, Commented Oct 21, 2021 at 13:06

MuzaffarShaikh · Accepted Answer · 2021-10-21 13:11:19Z

1

Found the solution for it. Apparently I missed to add one parameter in JsonProperty(). In the Car class, for carOwner object, I had to pass type of owner.

@JsonProperty({
    name: 'carOwner',
    type: Owner,
})

The above solved the issue I was facing.

answered Oct 21, 2021 at 13:11

MuzaffarShaikh

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