javascript - In mongoose how to iterate over array of ObjectId? -

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I try to rephire from Javascript object for the Mongoose object. I have two simple models:

Candidate model: 

  var candidateSchema = new schema ({name: string, score: {type: Number, default: 0, minimum: -2, max: 2}}); CandidateSmama.method.updateCor = function updateScore (NewScore) {this.score = newScore; };  Vote Model  with a list of candidates:  
  var voteSchema = new schema ({candidate: [type: schema type object, referee: 'candidate'}] }); Function candidates are already (candidates, new Candidates) before {var alreadyExists = false; For candidates. Each (job (candidate) {if (newCandidate.name === candidate name} {first Axis = true;}}); Will return in advance; } VoteSchema.methods.addCandidate = function addCandidate (newCandidate, callback) {var candidates = this.candidates; If (Candidates already candidates (candidates, new Candidates)) {candidates.push (newCandidate); } This.save (callback); };  
 
 I try to add a new candidate in my opinion, only if it does not exist. 
 
 I can not run again on my candidates (For the  candidates, each (task (candidate) {) because it is an array of _id and does not have an array of javascript objects 
 
 Does anyone have an idea?

Mongodybi It would be better to use. 

  voteSchema.methods .addCandidate = addCandidate function (new call, callback) {this.candidates.addToSet (newCandidate._id); this.save (callback) ;}

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