convert javascript plain object into model class instance

Question

I need to implement small ODM like feature. I get plain javascript object from database, and I need to convert it into my model class instance. Let's assume model looks like:

    class Model{
       constructor(){
           this.a = '777';
           ---- whole bunch of other things ---
       }
       print(){
           console.log(this.a);
       }
   }

So I need convert var a = {b:999, c:666} to instance of model and being able to call a.print() after, and when a.print() executed 777 should be placed in console. How to do that?

Answer 1

There have a simple method. Just assign the object to instance(this)

class Model
{
  constructor(obj){
    Object.assign(this, obj)
  }
  print(){
    console.log(this.a);
  }
}

let obj = {a: 'a', b: 'b', c: 'c'}
    
let m = new Model(obj)
console.log(m)
m.print()  // 'a'