How to display mongoose error to backbone views - validation

Question

So, I have a backbone view where I am trying to save a user
this.model.save(user_details, { // this is backbone model
error: function (model, errors) {
},
success: function (model, response) {
}
});
Backbone Model urlRoot points to a backend function where
// here user is a Mongoose schema
user.save(function (err) {
if (err) {
res.send(err.errors);
}
});
I am running some validation in Mongoose schema.
If the validation fails how can I display these "err.errors" on my backbone view.
I can see at terminal if i console log the errors but not being able to send them back to the views.

Answer 1

Found out the solution after looking through the "errors" object
All errors are returned in "errors.resposeText" which has format like
{
"key name": {
"message": "",
"name": "",
"path": "",
"type": "",
"value": ""
}
}
this.model.save(user_details, { // this is backbone model
error: function (model, errors) {
var err = JSON.parse(errors.responseText);
$.each(errors, function (name, err) {
// do something with error
console.log(name + err.message);
}
},
success: function (model, response) {
}
});
NOTE: Errors from mongodb like unique, dup keys are not appended in this format. So its upto us to change them to json and wrap it up in res.errors.
In case of error in unique keys user.save(function (err) {
if (err) {
if(err.code!='undefined' && err.code=='11000')
err.errors = {'email':{'message':'This unique value is already in db'}};
res.send(500, err.errors);
}