node.js - Mongoose fineOne does not work but find does -

findone gets undefined in result:

upload.findone({_id: req.params.id}, function (err, upload) {   if (err || !upload) return;   console.log(upload.name); /* empty string */ }); 

however using find instead result:

upload.find({_id: req.params.id}, function (err, upload) {   upload = upload[0];   if (err || !upload) return;   console.log(upload.name); /* prints out expected */ }); 

i confirmed in both cases mongo query run , through mongodb shell both returned expected result:

mongoose: uploads.findone({ _id: objectid("57196fced4595c2a09146891") }) { fields: undefined } mongoose: uploads.find({ _id: objectid("57196f0a8d2055520894d5a4") }) { fields: undefined } 

mongoose model:

const uploadschema = new schema ({   name: {type: string, default: '', trim: true},   mimetype: {type: string, default: '', trim: true} });  uploadschema.path('name').required(true, 'name cannot blank.'); uploadschema.path('mimetype').required(true, 'mimetype cannot blank.');  module.exports = mongoose.model('upload', uploadschema); 

what doing wrong?

node version: 5.10. 1, mongoose version: 4.4.10

thanks in advance!