How to select specific field in nested populate in mogoose

Question

here is my schema:

var UserSchema = new Schema({
    email: String,
    name: String,
    city: String,
    username: String,
    profilePic: String,
    phoneNo         


        

Answer 1

Use select property in populate as:

User.populate(user, { path: 'shortList.flat.project', model: 'Project', select: 'name' })

This will give you name of project only.

To give specify fields which you don't want you can zero as:

User.populate(user, { path: 'shortList.flat.project', model: 'Project', select: { 'name': 0, 'Floor': 0, 'flats': 0, 'towers': 0,} }

This works for me.

and if you are doing two level populations:

we can simply do it as:

populate('project.tower', 'name project flats');

for a simple populate to get specific feilds:

populate('project', 'name')

Answer 2

try to do this:

applicantListToExport: function (query, callback) {
  this
    .find(query).select({'advtId': 0})
    .populate({
      path: 'influId',
      model: 'influencer',
      select: { '_id': 1,'user':1},
      populate: {
       path: 'userid',
       model: 'User'
      }
    })
    .populate('campaignId',{'campaignTitle':1})
    .exec(callback);
  }