javascript - IDs in quotes when using MongoDB $setEquals -

i've got problem quoted ids in referenced array. when try this:

task.find({ game: req.user.game }).exec(function(err, task) {     if(err) {         console.log(err);     } else {         console.log(task[0].incategories);     } }); 

it writes array of ids in quotes node.js console (["5550a9604b24bcdc1b88cc76", "5551213c35d0516807b2cd99"]). i'm trying return task logged in user (look @ comments next console.log commands):

profession.find({ _id: req.user.profession }).exec(function(err, profession) {     if(err) {         return res.status(400).send({             message: errorhandler.geterrormessage(err)         });     } else {         console.log(profession[0].assignedtaskcategories); // output: array quoted ids         var pipeline = [             {                 '$match': { 'game': req.user.game,  }             },             {                 '$project': {                      'title': 1,                     'game': 1,                      'incategories': 1,                      'sameelements': {                          '$setequals': [ '$incategories', profession[0].assignedtaskcategories ]                      }                 }             }         ];         task.aggregate(pipeline).exec(function (err, tasks){             if(err) {                 return res.status(400).send({                     message: errorhandler.geterrormessage(err)                 });             } else {                 console.log(tasks[0].incategories); //array ids without quotes                 res.json(tasks);             }         });     } }); 

value of sameelements false, because $setequals compares arrays, 1 quoted ids, 1 without quotes , don't know why it's happening???

try casting assignedtaskcategories elements objectids first comparison:

console.log(profession[0].assignedtaskcategories); // output: array quoted ids var assignedtaskcategories = profession[0].assignedtaskcategories.map(function( category ) {     return mongoose.types.objectid(category); }); var pipeline = [     {         '$match': { 'game': req.user.game,  }     },     {         '$project': {              'title': 1,             'game': 1,              'incategories': 1,              'sameelements': {                  '$setequals': [ '$incategories', assignedtaskcategories ]              }         }     } ]; task.aggregate(pipeline).exec(function (err, tasks){     if(err) {         return res.status(400).send({             message: errorhandler.geterrormessage(err)         });     } else {         console.log(tasks[0].incategories); //array ids without quotes         console.log(tasks[0].sameelements); //true or false         res.json(tasks);     } });