Decimal support Mongodb - node.js

Question

Trying to use decimal128 datatype in my nodejs application.
mongo version "3.4.2",
os: { type: "Darwin", name: "Mac OS X", architecture: "x86_64", version: "16.7.0"
nodejs version 6.11.2
mongoose version 4.11.13
mongoose using native mongodb driver version 2.2.31
Mongodb config:
storage:
engine: wiredTiger
dbPath: "/Users/backend/Desktop/mongo/data"
What am i doing?
I've got mongoose subdocument schema
const Premises = mongoose.Schema({
floor : { type: mongoose.Schema.Types.Decimal128, required: true },
deleted : { type: Boolean, default: false },
created_at : { type: Date, default: Date.now },
updated_at : { type: Date, default: Date.now }
});
This schema is a subdocument of document with schema below:
...
premises : [ Premises ],
...
To add new subdocuments im using update method:
var queryFilter = {
'deleted' : false,
'buildings._id' : params.building_id
};
var premise = {
'_id': mongoose.Types.ObjectId(),
'floor': params['floor']
};
Block.update(queryFilter, { '$addToSet': { 'buildings.$.premises': premise } }, { safe: true }, function (error, result) {
result['_id'] = premise['_id'];
callback(error, result || null);
return;
});
Also i used code below:
var queryFilter = {
'deleted' : false,
'buildings._id' : params.building_id
};
var premise = {
'_id': mongoose.Types.ObjectId(),
'floor': mongoose.Types.Decimal128.fromString(params['floor'])
};
Block.update(queryFilter, { '$addToSet': { 'buildings.$.premises': premise } }, { safe: true }, function (error, result) {
result['_id'] = premise['_id'];
callback(error, result || null);
return;
});
But get the same error in both situations:
{"errors":{"name":"MongoError","message":"$numberDecimal is not valid
for
storage.","driver":true,"index":0,"code":52,"errmsg":"$numberDecimal
is not valid for
storage."},"data":{"ok":0,"n":0,"nModified":0,"_id":"59ce4e8cecba947a9a342f37"}}
I dont wanna use some workaround like
mongoose-double
to support negative numbers in my collections.
Much thanx for ur answers and solutions.

Answer 1

I faced with the same issue "$numberDecimal is not valid for storage" when I tried to add subdocument into array.
I tend to think this happens because of
Decimal128.prototype.toJSON = function() {
return { "$numberDecimal": this.toString() };
}
from http://mongodb.github.io/node-mongodb-native/2.2/api/node_modules_bson_lib_bson_decimal128.js.html
Maybe that is not the best solution but workaround below helped me:
mongoose.Types.Decimal128.prototype.toJSON = mongoose.Types.Decimal128.prototype.toString;
For adding item to an existing array I used:
entity.subentities.addToSet(subentity);
const updatedEntity = await entity.save();