CouchOne Tristania example

community.js

function map(doc){
    if(doc.username && doc.presentation){
        emit(doc._id, doc);
    }
}

document.js

{
   _id: "0DB6DACF-A385-5284-BFD2-519F9AC802BB",
   _rev: "31-62f831b083c0539e8276f667e357bef2",
   coords: {
       latitude: 57.863380432128906,
       longitude: 11.911527633666992
   },
   presentation: "moo moo moo moo",
   username: "David",
   favalbum: "rubicon",
   favtracks: {
       "rubicon": "patriotgames"
   }
}

result.js

{
    rows:[
        {
            key:null,
            value: {
                favalbum: {
                    votes:2,
                    results: {
                        rubicon: {
                            votes: 2,
                            percentage:100
                        }
                    }
                },
                favtracks: {
                    rubicon: {
                        votes: 1,
                        results: {
                            patriotgames: {
                                votes:1,
                                percentage: 100
                            }
                        }
                    }
                }
            }
        }
    ]
}

statistics.js

function map(doc){
    if(doc.favalbum || doc.favtracks){
        emit(doc._id, doc);
    }
}

function reduce(keys,values){
    var a,t,stats = { favalbum: {votes: 0,results:{}}, favtracks: {} };
    values.forEach(function(u){
        if (u.favalbum){
            if (!stats.favalbum.results[u.favalbum]){
                stats.favalbum.results[u.favalbum] = {votes:0};
            }
            stats.favalbum.results[u.favalbum].votes++;
            stats.favalbum.votes++;
        }
        if (u.favtracks){
            // omitted for brevity
        }
    }
    return stats;
}