How to control document do not get or add additional property in loopbak? - mongodb

Question

I have a registration model in loopback over mongodb with fallowing properties:
"properties": {
"Fname": {
"type": "string",
"required": true
},
"Lname": {
"type": "string",
"required": true
},
"phone": {
"type": "string",
"required": true
},
"date": {
"type": "string",
"required": true
},
"time": {
"type": "string",
"required": true
}
}
in application I post some additional data with model required data, for controlling and processing in server side:
submitForm() {
let headers = new Headers(
{
'Content-Type': 'application/json'
});
let options = new RequestOptions({ headers: headers });
let data = JSON.stringify({
Fname: this.form.Fname,
Lname: this.form.Lname,
phone: this.form.phone,
time: this.form.time,
date: this.form.date,
uid: this.form.uid
});
//console.log(data);
let url = 'http://localhost:3000/api/registrations';
return new Promise((resolve, reject) => {
this.http.post(url, data, options)
.toPromise()
.then((response) => {
console.log('API Response : ', response.status);
resolve(response.json());
})
.catch((error) => {
console.error('API Error : ', error.status);
console.error('API Error : ', JSON.stringify(error));
reject(error.json());
});
});
}
In server side I have this code:
Registration.observe('before save', function (ctx, next) {
if (ctx.instance) {
// When Create (POST)
// ctx.instance have the json properties
console.log("Triggers when create");
if (checkUID(ctx.instance) ==200 ){
console.log('ok');
}
} else {
// When Update (UPDATE)
// ctx.data have the json properties
console.log("Triggers when update");
}
next();
});
but after successfully registration I saw that uid that was added into document and regardless to model's properties, document contains addition properties.
{
"Fname": "Eram",
"Lname": "SA",
"phone": "1234567890",
"date": "2017/10/06",
"time": "17:37:46",
"id": "59d78e3f5e5e6704205038aa",
"uid": "38bc3241a43073a7b40d186f24923cc5"
},