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MongoDb unable to populate user

Hi I am trying to populate user into another schema called feedbackschema.

Feedback schema

const mongoose = require('mongoose');

const {
Schema,
} = mongoose;

// Create Schema
const FeedbackSchema = new Schema({
user: {
type: Schema.Types.ObjectId,
ref: 'users',
},
pro: {
type: String,
required: true,
},
con: {
type: String,
required: true,
},
comments: {
type: String,
required: true,
},
rating: {
type: String,
required: true,
},
});

// Create model
const feedback = mongoose.model('feedbacks', FeedbackSchema);

module.exports = feedback;

User Schema

const mongoose = require('mongoose');

const {
Schema,
} = mongoose;

// Create Schema
const UserSchema = new Schema({
name: {
type: String,
required: true,
},
email: {
type: String,
required: true,
unique: true,
lowercase: true,
},
password: {
type: String,
required: true,
},
isAdmin: {
type: Boolean,
required: true,
default: false,
},
});

// Create a model
const user = mongoose.model('users', UserSchema);

// Export the model
module.exports = user;

and here is my controller where I am trying to populate the user

getAllFeedbacks: async (req, res) => {
const errors = {};
try {
const feedbacks = await Feedback.find().populate('user');
return res.json(feedbacks);
} catch (err) {
errors.noFeedbacks = 'Please try again';
return res.status(404).json(errors);
}
},

Json I am receiving through postman is this

[
{
"_id": "5b3adf88f3c4cd836bdc2eda",
"pro": "knfklngfdklgnfdgknkln",
"con": "Sales executive updates",
"comments": "This is a another funfact for me is me too",
"rating": "8",
"__v": 0
}
]

It is supposed to show user key but somehow its not working. I checked the current user data is already there but for some reason its not pushing the user info feedback object.

FeedBack collection

[
{
"_id": {
"$oid": "5b3adf88f3c4cd836bdc2eda"
},
"pro": "knfklngfdklgnfdgknkln",
"con": "Sales executive updates",
"comments": "This is a another funfact for me is me too",
"rating": "8",
"__v": 0
}
]


User Collection

[
{
"_id": {
"$oid": "5b37e456565971258da97d5e"
},
"isAdmin": false,
"name": "montygoldy",
"email": "montygoldy@gmail.com",
"password": "$2a$10$zWbxV0Q3VPUxRC6lzJyPBec3P/8zYBaSCTJ2n88Uru3zzFlicR2rq",
"__v": 0
}
]


1 Answer
1

You can try below aggregation

Feedback.aggregate([
{ "$lookup": {
"from": User.collection.name,
"pipeline": [
{ "$match": { "$expr": { "$eq": [ "$_id", mongoose.types.ObjectId(loggedInUserId) ] } } }
],
"as": "user"
}},
{ "$unwind": "$user" }
])


Please change User.collection.name with your corresponding user collections name... Which might be user or users

User.collection.name

user

users

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