Backbone.Collection#fetchSingle - only one request in the air at a time

gistfile1.js

var MyCollection = Backbone.Collection.extend({
    fetchSingle : function() {
        if (this.currentFetch && this.currentFetch.state() === "pending") this.currentFetch.abort();

        this.currentFetch = this.fetch.apply(this, _.toArray(arguments));
        return this.currentFetch;
    }
});