Recursive function jquery with backbone

Question

I have an app in backbone where I want to find inside a Json some records and print out.

my JSON is like this:

[
  {
    \"id\" : \"r1\",
    \"hotel_id\         


        

Answer 1

First you should split your rooms list by hotels and levels:

var rooms = _(allRooms.groupBy, "hotel_id");
for (var hotelid in rooms)
    rooms[hotelid] = _.groupBy(rooms[hotelid], "level");

The "combinations" you're looking for is the cartesian product of the levels (for each hotel). You can use this helper function for example. Use it like this:

_.each(this.collection.models, function(hotel) {
    var levels = rooms[hotel.id];
    var combinations = cartesian(_.values(levels));
    // put them on the hotel
});