TypeORM FindById doesn't work with MongoDB

Question

I'm trying to use TypeORM with MongoDB and express but I'm having problems with the basic stuff.

I just created a controller with basic CRUD operations for an entity. The methods save, findAll and find by Filter works ok, but I can't make the methods that require an mongo id work.

router.get("/", async(req: Request, res: Response) => {
    const investmentRepository = getMongoRepository(Investment);

    const investments = await investmentRepository.find();
    res.send(investments);
});

router.get("/:id", async(req: Request, res: Response) => {
    const investmentRepository = getMongoRepository(Investment);
    const investment = await 
    investmentRepository.findOneById(req.params.id);
    if (!investment) {
        res.status(404);
        res.end();
    }
    res.send(investment);
});

The second method is always returning 404. For example, this is an entity returned on get all "investment/"

{
    "id": "59dfd8cadcbd9d1720457008",
    "name": "Teste LCI",
    "startDate": 1466305200,
    "numberOfDays": 365,
    "type": "LCI_LCA"
}

If I try to send a request for this specific object calling

investment/59dfd8cadcbd9d1720457008

the response is always 404.

The same behavior happen with the delete method, raising an exception

Cannot find entity to remove by a given id

I also tried to convert the string to ObjectID using:

new ObjectID(req.params.id);

but it fails with the error ObjectID is not a constructor.

Answer 1

If you're receiving the error ObjectId is not a constructor it is because you forgot to require it in your file. All you need is:

const ObjectId = require('mongodb').ObjectId;