Let say I have a Object:
class Person{
id: number;
name: string;
}
And Json from API:
{
"id": "10",
"name": "Person Name",
"email": "[email protected]"
}
How to convert from JSON to Person object, excatly variables that is in Person class?
I tried this:
Object.assign(Person.prototype, this.jsonList))
but i'ts not working
The information about what properties are declared in a class is "metadata", and is not directly accessible. Hence, there is no straightforward way to copy only those properties present in a class from some input which might contain additional unwanted properties, other than explicitly enumerating them.
The feature of JavaScript/TypeScript which does have access to such metadata is decorators. Therefore, to solve your problem in a generalized way requires such a decorator. The decorator could generate a static method which copied just those properties which actually exist on the class. That would look like that:
@ConstructFromJsonWithExtraGarbage()
class Person {
}
const sally = Person.constructWithExtraGarbage(
{id: 1, name: "Sally", email: "[email protected]"});
Actually writing this decorator is beyond the scope of this answer.
this.id = person.id; this.name = person.name;. What's the concrete problem?
new Person(json.id, json.name)?