const modelInstance = new RegisterModel({
   cred: {
       nameValue: 'Sample',
       emailValue: 'sample@gmail.com',
       passwordValue: 'sample122',
   },
   location: {
       addressValue: 'sample address',
       cityValue: 'sample',
       stateValue: 'sample',
       postalValue: 123344,
   },
   card: {
       cardName: 'Sample',
       cardNumber: 231232143,
       securityCode: 131,
       expirationMonth: 1,
       expirationYear: 2022,
   },
})
modelInstance.save(function (err) {
   console.log('@@@@@ Inside the callback ', err);
   if (err) {
       console.log('the error is ', err);
   }
   console.log('saved the model instance @@@@@@');
   console.log(modelInstance, '@@@@@Helllo@@@@@');
});
modelInstance.find({postalValue: 123344 }).then(model=>
   console.log('model@@@',model)
   )