Mongoose, find, return specific properties

Question

I have this get call:

exports.getBIMFromProject = function(req, res){   mongoose.model('bim').find({projectId: req.params['prj_id']}, function(err, bim){     if(err){       console.error(err);       res.send(500)     }     res.send(200, bim);   }); }; 

Where do I specify which properties I want to return? Can't find it in the docs. The above returns the entire object. I only want a few properties returned.

This is my schema:

var mongoose = require('mongoose'),   Schema = mongoose.Schema;  var bimSchema = new Schema({   projectId: Number,   user: String,   items:[     {       bimObjectId: Number,       typeId: String,       position:{         floor: String,         room:{           name: String,           number: String         }       }     }   ] });  mongoose.model('bim', bimSchema); 

I don't want the items array included in my rest call.

Answer 1

You use projection. The first example in the mongoose query docs has a projection operation tucked in.

NB: not real code b/c I highlighted the important bits with triple stars

// find each person with a last name matching 'Ghost', ***selecting the `name` and `occupation` fields*** Person.findOne({ 'name.last': 'Ghost' }, ***'name occupation'***, function (err, person) {   if (err) return handleError(err);   console.log('%s %s is a %s.', person.name.first, person.name.last, person.occupation) // Space Ghost is a talk show host. }) 

The Person schema isn't specified but I think the example is clear enough.