Backbone: how can I reference a Collection from a Model

Question

I know it's more often done in the opposite way, but in my specific use case I'd need to have a Model PostsTimes with a reference to a Collection (of another Model Post). Right now I'm trying:

var Posts = Backbone.Collection.extend({
    model: Post
});
var posts = new Posts(); // my collection



var PostsTimes = Backbone.Model.extend({
    url: "api/times.php",
    initialize: function(options){
        this.posts = options.posts;
    },
    test: function(){
        console.log(this.posts);
    }
});

var poststimes = new PostsTimes({posts: posts});

But this.posts in PostsTimes always stays undefined. Is there any way I can do this without defining a global variable?

Answer 1

The structure of what you have is correct, so the reason it would be logging undefined is because the this in your test function is something other than the model's instance.

So your PostsTimes would become

var PostsTimes = Backbone.Model.extend({
    url: "api/times.php",
    initialize: function(options){
        _.bindAll(this);
        this.posts = options.posts;
    },
    test: function(){
        console.log(this.posts);
    }
});