Loopback REST findById doesn't work well - node.js

Question

I'd like to use findById function through REST API.
I defined "ID" as string all constructed by number.
I try to find by ID, the system seems to recognize it number.
I can't use it when the ID is a big number over "9007199254740992" - max number of integer.
I'd like to use ID just as string.
Please tell me how to solve this problem.
Thank you,
--follow up--
My program is as follow.
Model - sample-model.json
{
"name": "SampleModel",
"base": "PersistedModel",
"idInjection": true,
"properties": {
"id": {
"type": "string",
"id": "true",
"required": true,
"doc": "MODEL ID"
},
"prop1": {
"type": "string",
"required": true
}
},
"validations": [],
"relations": {},
"acls": [],
"methods": []
}
When I access to findById function through REST API, I always get following debug message.
strong-remoting:shared-method - findById - invoke with +11ms [ 9007199254740992, undefined, [Function: callback] ]
strong-remoting:shared-method - findById - result null +25ms
strong-remoting:rest-adapter Invoking rest.after for SampleModel.findById +6ms
express:router restRemoteMethodNotFound : /api/SampleModels/9007199254740993 +143ms
express:router restUrlNotFound : /api/SampleModels/9007199254740993 +8ms
express:router restErrorHandler : /api/SampleModels/9007199254740993 +2ms
strong-remoting:rest-adapter Error in GET /SampleModels/9007199254740993: Error: Unknown "SampleModel" id "9007199254740993".

Answer 1

I resolved my question by myself.
We can define arguments that the remote method accepts using "accepts" option.
Built-in findById function defines as follow at PersistedModel:
accepts: [
{ arg: 'id', type: 'any', description: 'Model id', required: true,
http: {source: 'path'}},
{ arg: 'filter', type: 'object',
description: 'Filter defining fields and include'}
],
When the type is defined any, the id changes to number by HttpContext.coerce function - if the id consists only number chars.
To solve this problem, I defines SampleModel.findByIdCustom and create another remote method as follow:
SampleModel.js
SampleModel.findByIdCustom = function(id, filter, cb) {
SampleModel.findById(id, filter, cb);
}
//Define remote method
SampleModel.remoteMethod(
'findByIdCustom',
{
description: 'Find a model instance by id from the data source.',
accessType: 'READ',
accepts: [
{ arg: 'id', type: 'string', description: 'Model id', required: true,
http: {source: 'path'}},
{ arg: 'filter', type: 'object',
description: 'Filter defining fields and include'}
],
returns: {arg: 'data', type: 'user', root: true},
http: {verb: 'get', path: '/:id'},
rest: {after: SampleModel.convertNullToNotFoundError},
isStatic: true
}
);
//disable built-in remote method
SampleMethod.disableRemoteMethod('findById', true);
Thank you,

Answer 2

Just set idInjection to false (so that loopback doesnt automatically add an id property to your model), then define a property with the following parameters:
{
"idInjection": false,
"properties": {
"id": {
"type": "string",
"id": true,
"generated": true
}
}
}