Calling a method from inside of another class

Question

I have a node class like this:

var Classes = function () {
};

Classes.prototype.methodOne = function () {
    //do something
};

when i want to call methodOne, i use this:

this. methodOne();

And it works. But right now i have to call it from inside of another method of another class. This time its not works and cant access to methodOne :

var mongoose = new Mongoose();
mongoose.save(function (err, coll) {
  //save to database
  this. methodOne(); //this does not work
}

how i can call methodOne? i use Classes.methodOne() but it's not work

Answer 1

this inside the save callback is in a new context and is a different this than the outside one. Preserve it in a variable where it has access to methodOne

var that = this;
mongoose.save(function (err, coll) {
  //save to database
  that.methodOne();
}