Dart convert data to custom class

Question

I have a function Future<T?> getDocById<T>(String id) aysnc {} , it gets the data from web and return the value with type T . How can I convert any incoming data from web to a given type?

use case - class User{ String name; User(this.name);} class User{ String name; User(this.name);} now, await getDocById<User>() how can I convert the data to type User inside getDocById function? in another case - getDocById<Boo> it should get data from web and convert it to Boo and return

Answer 1

Since I just answered a similar question I am copying the code into here. However, if you have an unknown T incoming, you need to distinguish cases based on what is incoming. Without this you want be able to convert a bool or int into a String name .

Create a method in one of the classes

class A {
 A(this.a);
 final int a;
 
 B toB() {
    return B(
    b: a,
  }
}  

class B {
 B(this.b);
 final int b;
}

To be used like final bInstance = aInstance.toB();meaning you declared somewhere aInstance = A(1);