AngularJS models, working with angular.extend(object.prototype, ...) vs angular.extend(object, ...)

Question

I'm working on a service as a model in AngulaJS. I use a factory nad I want to use the angular.extend() thing to add attributes/properties to the $resource object.

The problem is that I can't access attributes added with this :

var myObject = $resource(...);

angular.extend(myObject.prototype, {
    hi : "hi",
    findFriend : function(){ console.log("You are all alone...") }
}

I'm not able to access "hi" or "findFriend" in my controller nor in the factory with a console.log().

But if I do this :

var myObject = $resource(...);

angular.extend(myObject, {
    hi : "hi",
    findFriend : function(){console.log("It works"}
}

Then I'm able to access those attributes. If the good practice is the second one, then what is the difference with :

var myObject = $resource(...);
myObject.hi = "hi";
myObject.findFriend("It works");

?

I read the documentation and followed this article to build my model.

Can someone explain why one work and not the other ? Why it seems to be different from the article ?

Thank you :)

Mathieu Bertin · Accepted Answer · 2014-10-23 09:36:22Z

1

It is because your var myObject is not an instance of a class so extending the prototype will add method for instance not for class. $resource return a "class" object so you need to instanciate an instance of myObject by using new myObject().

answered Oct 23, 2014 at 9:36

Mathieu Bertin

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2 Comments

ogdabou Over a year ago

Thanks for the answer. What should I do so, is it bad to stay with the myObject = $resource() then modify with angular.Extend(myObject, ...) ?

Mathieu Bertin Over a year ago

No it is not bad, but you are not doing OOP, and it suggest that you instantiate your class.

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