Tour nested tracks

iTourU

{
    "tour": {
        "title": "New tour uploading test",
        "description": "Test Description",
        "tags": "Test ",
        "transport_type": "0",
        "published": "true",
        "tracks_attributes": [{
            "position": "1",
            "title": "Stop 1",
            "geotag": "true",
            "length": "19.529937",
            "lat": "46.558860",
            "lng": "6.328125",
            "upload_base64": "Y2FmZgACAgAgICA==",
            "upload_filename": "321690607.caf",
            "description": "Description here",
            "track_pics_attributes": [{
                "upload_base64": "/9j/4AAQSkZJRgABAQAAAQABAAD/4QBYRXhpZgAATU0AKgAAAAgAAgESAAMof/Z",
                "upload_filename": "321690709.jpg"
            }]
        },
        {
            "position": "2",
            "title": "Stop 2",
            "geotag": "true",
            "length": "0.000000",
            "lat": "46.558860",
            "lng": "6.328125",
            "description": "Description here",
            "track_pics_attributes": [{
                "upload_base64": "/9j/4AAQSkZJRgABAQAAAQABAAD/btof/Z",
                "upload_filename": "321690766.jpg"
            }]
        }],
        "upload_base64": "/9j/4AAQSkZJRgABAQAAS6LdTb/AAbtof/Z",
        "upload_filename": "321690780.jpg"
    }
}