Mongoose unique property still allowing me to save to db - node.js

Question

Im under the assumption that adding unique: true to a field would stop from saving to the database using the same value. But im still allowed to do it.
"mongoose": "^5.4.19",
const SessionSchema = new Schema({
jobId: {
type: String,
required: false,
unique: true,
index: true,
},
productId: {
type: String,
required: true,
},
status: {
type: String,
default: "Pending",
},
mode: {
type: String,
default: "authentication",
},
result: {
type: Schema.Types.Mixed,
},
requests: [RequestSchema],
callback_at: {
type: Date,
},
}, {
timestamps: { createdAt: "created_at", updatedAt: "updated_at" },
});
I have already tried deleting and recreating the collection. See the image below i can create new session with the same jobId being 1.
public store = async (req: Request, res: Response): Promise<any> => {
const input = req.body;
let session = new Session({
productId: input.productId,
jobId: input.jobId,
});
try {
session = await session.save();
const response = {
success: true,
status: 201,
data: { session },
message: "SESSION CREATED",
};
return res.status(response.status).json(response);
} catch (err) {
const response = {
success: false,
status: 500,
errors: [],
message: "UNEXPECTED SESSION ERROR",
};
if (err.code === 11000) {
response.errors.push({
code: 11000,
message: "Duplicate key error jobId",
});
}
return res.status(response.status).json(response);
}
db.sessions.getIndex();
[
{
"v" : 2,
"key" : {
"_id" : 1
},
"name" : "_id_",
"ns" : "myDB.sessions"
}
]

Answer 1

You have to understand that unique is an index configuration option in your schema.
For instance, if the users collection doesn't have a unique index on userName, then you need to wait for the index to build before you start relying on it.
const user = new mongoose.Schema({
userName: { type: 'String', unique: true },
});
const User = db.model('User', user);
const doc = new User({
userName: 'Bob'
});
return User.init() // `User.init()` returns a promise that is fulfilled when all indexes are done
.then(() => User.create(doc))
.then(() => User.create({ userName: 'Bob' }));
}

Answer 2

I was not using unique properly: https://mongoosejs.com/docs/validation.html#the-unique-option-is-not-a-validator
Need to wait until the indexes are built before relying on unique to be a validator.
I changed my mongoose connect options to look like the following
options: {
useNewUrlParser: true,
useCreateIndex: true,
autoIndex: true,
},
I;m not sure if its the most appropriate solution, but its the one ive gone with for now.