How do I add a custom method to a backbone model?

Question

I've tried:

initialize: function() {
    if (this.get("id") == "modelOfInterest") {

        var func = function() {
           //do some stuff with the model
         }
         _.bind(func, this)

    }
}

and

initialize: function() {
    if (this.get("id") == "modelOfInterest") {
          var func = function() {
            //do some stuff with the model
          }
          this.on("func", func, this);
     }
}

However in both cases:

myModelInstance.func(); //object has no method func

I'd prefer not to use _.bindAll() .

I've edited the code above to show that I am trying to bind func to only one model. The model is initialize when it is added to a collection : all the models fire initialize at the same time and I just want to bind func to one of them.

Answer 1

Any reason not to do the obvious?

Model = Backbone.Model.extend({
  func: function() {
  },
})

Answer 2

Assign func as a property of your model in your if block.

var Model = Backbone.Model.extend({
  initialize:function() {
    if (this.get('id') === 1) {
      this.func = function() {
          // your logic here
      };               
      this.on('func',this.func,this);
    }
  }
});

Answer 3

Static methods should be declared on a second dictionary within the .extend call:

SomeModel = Backbone.Model.extend({
  initialize: function(){}
},{
  someStaticFunction: function(){
      //do something
  } 
});

http://danielarandaochoa.com/backboneexamples/blog/2013/11/13/declaring-static-methods-with-backbone-js/

Answer 4

Try this:

SomeModel = Backbone.Model.extend({
  initialize: function(){},
  someFunction: function(){
      //do something
  } 
});

And this:

var model = new SomeModel();
model.someFunction();