LoopBack WARNING: id property cannot be changed from to - mongodb

Question

I'm using LoopBack with MongoDB as my datasource and have a simple model defined as:
{
"name": "restaurant",
"plural": "restaurants",
"base": "PersistedModel",
"idInjection": false,
"options": {
"validateUpsert": true
},
"properties": {
"name": {
"type": "string",
"required": true
},
"address": {
"type": "string",
"required": true
}
},
"validations": [],
"relations": {},
"acls": [],
"methods": {}
}
I have an auto-migrate script in my /server/boot which creates two simple test data.
After that when I try to update one of those entries with PUT request using LoopBack's API explorer I get a warning
WARNING: id property cannot be changed from ... to ... for model:restaurant in 'before save' operation hook
WARNING: id property cannot be changed from ... to ... for model:restaurant in 'loaded' operation hook
and redundant id field (same as mongo's _id field) is created in DB.
I was able to prevent the creation of the redundant id field by setting idInjection to false and defining another property in model definition as:
"_id": {
"id": true,
"generated": true
}
However, I still get the warning after doing a PUT request from LoopBack's API explorer.
How should the mongo's _id field be defined in model definition properly?
Thanks.

Answer 1

You could hide the id by adding a "hidden" field to your model JSON. And add "id" to the array to be hidden.
{
"name": "restaurant",
"plural": "restaurants",
"hidden": [
"id"
],
"base": "PersistedModel",
"idInjection": false,
"options": {
"validateUpsert": true
},
"properties": {
"name": {
"type": "string",
"required": true
},
"address": {
"type": "string",
"required": true
}
},
"validations": [],
"relations": {},
"acls": [],
"methods": {}
}