Access constructor value of another class in node.js

Question

I got the following problem :

1) Two classes in class.js

Class1 {

   //here the constructor

   constructor(connection){

   this.connection = connection

}

  //here a class1 prop

  returnConnection(){

    return this.connection

  }
}

// class 2

Class2 extends Class1 {

  getClass1ConstructorConnection{

   return super.returnConnection();

 }
}

module.exports = {Class1, Class2}

Now in my route file I declare class1

var { Class1 } = require(./class.js);
var { Class2 } = require(./class.js);
var class1Object = new Class1({connectionObj})

And after that, i declare class2

var class2Object = new Class2();

if I try to console.log class2 prop like this

console.log(class2Object.getClass1ConstructorConnection())

It gets undefined.

Now, I know the best would be to declare the connectionObj as a native constructor of class 2, but for a bunch of reasons I can't, so, is there a way to inherit a constructor variable value by a parent class after its declaration in the main app workflow?

Thank you for your help!

It's a connectionObj from mysql! And i need it as in other props of class2 i should use this connection object to do some queries... — Ermanno Palmizio Salieri
– Ermanno Palmizio Salieri, Commented Sep 21, 2017 at 8:59

Ivan Mladenov · Accepted Answer · 2017-09-21 09:03:50Z

1

Because you never pass the connection to the base class. You have to pass your connection to the constructor

var class2Object = new Class2({connectionObj});

answered Sep 21, 2017 at 9:03

Ivan Mladenov

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