Why do I get array of nulls in my database? [duplicate] - mongodb

Question

This question already has answers here:
Node.js Mongoose.js string to ObjectId function
(9 answers)
Closed 4 years ago.
I have an array of ids which is launchIds.
I'm trying to push it on a model field trips with
$addToSet: { trips: { $each: launchIds }. This gives me an error: Cast to [ObjectId] failed for value \"[\"1\",\"2\",\"3\"]\...
if I try to map through launchIds and convert to Mongoose.Shema.Types.ObjectId I get in the database trips: [null,null,null]
lauchIds = ['1','2','3']
async bookTrips({ launchIds }) {
let userId = "5bf7f7b3817119363da48403";
const mongoIds = launchIds.map(l => Mongoose.Schema.Types.ObjectId(l));
return this.store.User.findByIdAndUpdate(
{ _id: userId },
{
$addToSet: { trips: { $each: mongoIds } }
},
{ new: true }
);
}
Here's my model Schema:
const UserSchema = new Mongoose.Schema(
{
email: {
type: String,
required: true
},
token: String,
trips: [
{
type: Mongoose.Schema.Types.ObjectId,
ref: "trip"
}
]
},
{ timestamps: true }
);
I'm passing ids via grapql playground. Here's my mutation:
bookTrips: async (_, { launchIds }, { dataSources }) => {
console.log(launchIds);
// logs ['1','2','3']
console.log(typeof launchIds);
//Object
const results = await dataSources.userAPI.bookTrips({ launchIds });
console.log(results);
return { message: "hello" };
}

Answer 1

To convert a string or a number into mongo object use Mongoose.Types.ObjectId,
const mongoIds = launchIds.map(l => Mongoose.Types.ObjectId(l));

Answer 2

I was getting back an array of strings where this should be numbers
The solution:
My model (same as above):
const UserSchema = new Mongoose.Schema(
{
email: {
type: String,
required: true
},
token: String,
trips: [
{
type: Mongoose.Schema.Types.ObjectId,
ref: "trip"
}
]
},
{ timestamps: true }
);
crud API:
async bookTrips({ launchIds }) {
let userId = "5bf7f7b3817119363da48403";
const idsToNums = launchIds.map(Number);
const mongoIds = idsToNums.map(l => Mongoose.Types.ObjectId(l));
return this.store.User.findByIdAndUpdate(
{ _id: userId },
{
$push: { trips: { $each: mongoIds } }
},
{ new: true }
);
}
Notice the Mongoose.Schema.Types.ObjectId on model and Mongoose.Types.ObjectId on api. If I remove Schema from model or add Schema to api I'm getting an error. Not sure why, but the above example works. I hope someone will find this helpful or suggests a better solution.