javascript - BackboneJS - get specific value from collection using _.max method -

i want specific value model inside collection. collection sorted id (contest_id) served database , gets delivered json. so, json looks like:

data : [{      "contest_id" : "3",      "artist" : {         "artist_name": "some name",         "artist_cover" : "some image.jpg"       }     },     "contest_id" : "1",     .... }] 

now, have glued together:

var contestimage = _.max(this.collection.tojson(), function(cnt){     return cnt.contest_id; }); 

i highest contest_id, want how proceed when want grab image? , display it?

thanks in advance...

the max method should available directly backbone collection (although it's underscore method, it's mixed backbone's collections), means can simplify code bit.

something should trick:

var model = this.collection.max(function (cnt) {     return cnt.contest_id; }); var contest_id = model.get('contest_id'); 

the first section returns model want, , second gets contest id attribute.

to artist cover attribute, can convert json:

var artist_cover = model.tojson().artist.artist_cover; 

or artist attribute model:

var artist_cover = model.get('artist').artist_cover;