.map returns an array of empty objects after getting data with Mongoose

Question

I have a problem when i want an array of collections returned back to me using Mongoose. The problem is that the .map method in the code returns an array of empty objects, but if I log the objects individually in the .map everything is fine. Why is this happening?

const patients = doctor.patients.map(async patient => {
  try {
    const patientObj = await Patient.findOne({ username: patient });
    patient = patientObj;
    patient.jwt = undefined;
    patient.__v = undefined;
    console.log(patient);  // This works just fine, logs the object the right way

    return patient;
  } catch (err) {
    console.log(err);
  }
});
console.log(patients); // This logs [{}, {}, {}]

1. You have no return in your mapping function. 2. You pass an async callback so you'd get an array of promises back regardless of what code you have. — VLAZ
– VLAZ, Commented Mar 22, 2020 at 21:37
Also in your mongoose schema you can add (select: false), so you do not have to set patient.password to undefined password: {type: String, select: false}, — Fullhdpixel
– Fullhdpixel, Commented Mar 22, 2020 at 21:39
Moreover, it seems like you just want a list of patients for a specific doctor? — Fullhdpixel
– Fullhdpixel, Commented Mar 22, 2020 at 21:41
@Fullhdpixel that is correct. Also, it doesn't seem to work after adding "return" either. — Robert Feduș
– Robert Feduș, Commented Mar 22, 2020 at 21:42

Fullhdpixel · Accepted Answer · 2020-03-23 08:57:39Z

1

I guess you want to have an array of patients which are related to one doctor. Try this solution.

Patient.find({
    username: { $in: doctor.patients }
}, (err: any, patients) => {
    console.log("patients  " + patients)
})

In your Patient model add (select: false), so you do not have to set every field to undefined https://mongoosejs.com/docs/api.html#schematype_SchemaType-select

edited Mar 23, 2020 at 8:57

answered Mar 22, 2020 at 21:44

Fullhdpixel

8231 gold badge13 silver badges28 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Matt Over a year ago

Link to current docco mongoosejs.com/docs/api.html#schematype_SchemaType-select

Collectives™ on Stack Overflow

.map returns an array of empty objects after getting data with Mongoose

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related