Missing subdocument while trying to fetch a document - node.js

Question

Issue:
I am creating an accounts table with the schema as shown below. I have just one account document for a user in a mongo server that's running in my localhost. After defining the schema and adding a single account document, I wrote an endpoint to query and fetch that document (Model.find(id: '12345')) using the id key. The resulting JSON document has all the data except the subdocument named accRef as show in the Schema below. When I try the same find query using the Mongo Shell, I get the results perfectly. I've been trying to find what's causing this for almost an entire day now, without making much headway. Any help would be highly appreciated.
I started with an empty schema and added each field one by one, starting with the id attribute and fire the find query. Every single time, I get all the 75+ elements and subdocuments, but the moment I add the accRef subdoc to my schema, this piece of info disappears from the result.
Is there a limitation to the number of subdocuments that can be defined in mongoose's schema?
Also, I cannot seem to insert/save any new account object using the same schema as shown below. However, I can perform this insert/save operation using the very same JSON object, using a client like MongoChef.
Here's my JS module where I've defined my schema:
import mongoose from 'mongoose';
mongoose.connect('mongodb://localhost:27017/accounts');
const Schema = mongoose.Schema;
const accountsSchema = new Schema({
_id: Schema.ObjectId,
id: String,
uuid: String,
firstName: String,
lastName: String,
contactNumber: Number,
dob: Date,
email: String,
originalEmail: {type: String, index: true},
password: String,
socialMedia: {
facebook: {
id: String,
email: String,
token: String
}
},
domainInfo: {
country: String,
currency: String,
lang: String,
domain: String
},
profile: {
type: Number,
id: Number,
points: Number,
accumulated: Number
},
perks: {
id: Number,
type: Number
},
address: {
address: String,
postalCode: String
},
paymentInfo: {
cardNumber: String,
isValidCard: Number,
paypal: {
email: String
},
bank: {
bankName: String,
bankNumber: String,
accontId: Number,
accountHolderName: String,
bankBranchCode: String,
paymentTypeId: Number
},
dateCreated: {type: Date, default: Date.now},
dateModified: {type: Date, default: Date.now},
createdAt: {type: Date, default: Date.now},
updatedAt: {type: Date, default: Date.now}
},
metadata: {
timezone: String,
ipAddress: String,
signupMeta: String,
clientUserAgent: String,
signupUrl: String
},
accRef: {
type: String,
code: String,
url: String
},
key: String,
parentId: String,
type: String,
utm: String,
bounced: Number,
status: Number,
isPoints: Number,
isAdmin: String,
dateTutorialCompleted: {type: Date, default: Date.now},
dateCreated: {type: Date, default: Date.now},
dateModified: {type: Date, default: Date.now},
dateAccessed: {type: Date, default: Date.now},
dateVerified: {type: Date, default: Date.now},
datePurchased: Date,
createdAt: {type: Date, default: Date.now},
updatedAt: {type: Date, default: Date.now}
});
const Account = mongoose.model('Account', accountsSchema);
export default Account;
The function in the service class that fires the mongo query:
import Account from '../../models/mongo';
const getAccountById = (accountId) => {
return Account.find({id: accountId})
.then(response => {
if(response.length === 0) {
throw new Error("Account Not Found");
}
console.log(response);
return response;
})
.catch(error => {
throw new Error(error.message);
});
};
Mongoose Version tried with: 4.7.7 and 4.7.8 (tried both)
MongoDB Version tried with: 3.2 and 3.4 (tried both)
Node Version: 7.4.0