How to select two table (document) value at a time by user id in mongoose?

Question

I am using NodeJs, ExpressJs with Mongodb and Mongoose. I want to select two document\'s value by user id.

I have three model User, Academic and Career. I have made a re

Answer 1

Since Mongoose is used here: This can achieved using Populate. populate is pretty similar/analogues to what you would achieve via $lookup aggregation in pure mongo.

An alternative option: If you would adjust your schemas like this to really leverage Mongoose.

//user model
const userSchema = new mongoose.Schema({
  name: { type: String },
  email: { type: String },
  career: {
    type: Schema.Types.ObjectId,
    ref: "Career"
  },
  academic: {
    type: Schema.Types.ObjectId,
    ref: "Academic"
  }
});

//academics and career can be array of documents as well -if required
const user = mongoose.model("User", userSchema);

// academic model
const academicSchema = new mongoose.Schema({
  academicLevel: { type: String },
  passYear: { type: Number }
});
const academic = mongoose.model("Academic", academicSchema);

// career model
const careerSchema = new mongoose.Schema({
  jobTitle: { type: String },
  company: { type: String }
});
const career = mongoose.model("Career", careerSchema);

Populate query: To get user's academics and career docs

const user = await User.find({ _id: requestedUserId })
  .populate("academic")
  .populate("career")
  .exec();

NOTE: requestedUserId is the user id that to be filtered upon.