JavaScript Prototype fails to include a method

I have the code snippet below implemented in my application:

app.factory('User', ['railsResourceFactory', '$http', function (railsResourceFactory, $http) {
    var res = railsResourceFactory({url: '/users', name: 'user'});

    res.prototype.hello = function () {
        return "hello";

    };

    debugger;

    return res;
}]);

Currently, I am utilizing the angularjs-rails-resource gem. When I reach the debugger in Chrome and execute the following command in the console:

res.hello()

An error message is displayed as follows:

TypeError: Object function RailsResource(value) { angular.extend(this, value || {}); } has no method 'hello'

I'm uncertain about the root cause of this issue. Being relatively new to JavaScript, I suspect there might be a fundamental misunderstanding regarding Prototypes on my end. Alternatively, it could potentially stem from complications within Angular or Rails.

Thank you for your assistance.

Answer №1

The prototype property is specifically designated for functions. One of the key questions to consider is whether

railsResourceFactory({url: '/users', name: 'user'});

returns a function or constructor. In this case, it does not. Instead, it returns a resource object. If you have experience with classical OOP languages, think of the prototype property as only accessible to classes and not objects. However, if you still need to access the prototype of the current object, you can do so by invoking

object.constructor.prototype

To achieve your goal, you can modify the object's prototype by using the following method:

res.constructor.prototype.hello = function () {
        return "hello";
    };

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