pagedNestedCollection.js

var NestedCollection = Backbone.Collection.extend({
  // Takes parent and nestedPath, corresponding to the parent
  // of this nested collection, and the name of the nested 
  // resource to be used in the url for this collection.
  initialize: function(undefined, options) {
    Backbone.Collection.prototype.initialize.apply(this, arguments);
    this.parent = options && options.parent;
    if ( !this.parent || ! this.nestedPath ) {
      throw "a parent model, corresponding to the parent of this Nested, " +
        "must be provided at initialization, as well as the nestedPath";
    }
  },
 
  // Uses the path of the parent to generate the url for this
  // nested collection.
  url: function() {
    return _.result(this.parent, "url") + "/" + nestedPath;
  }
});

var PagedNestedCollection = NestedCollection.extend({
  // paging implementation
});