Loopback custom connector implementation - loopbackjs

Question

I am trying to implement a custom loopback connector and it's not clear to me how this all works.
Here are my models:
{
"customer": {
"dataSource": "qb",
"public": false
},
"company": {
"dataSource": "qb",
"public": true
},
"payment": {
"dataSource": "qb",
"public": false
},
"invoice": {
"dataSource": "qb",
"public": false
}
}
The most important part to the model (and to save space) is
{
"relations": {
"company": {
"type": "belongsTo",
"model": "company",
"foreignKey": "id",
"primaryKey": "id"
}
}
}
And, in company.json
{
"name": "company",
"plural": "companies",
"base": "Model",
"idInjection": true,
"options": {
"validateUpsert": true
},
"properties": {
"id": {
"type": "string",
"required": true
}
},
"validations": [],
"relations": {
"customers": {
"type": "hasMany",
"model": "customer",
"foreignKey": "customerId"
},
"payments": {
"type": "hasMany",
"model": "payment",
"foreignKey": "customerId"
},
"invoices": {
"type": "hasMany",
"model": "customer",
"foreignKey": "customerId"
}
},
"acls": [],
"methods": {}
}
which, as expected, produces URLs like:
/companies/${id}/customers/${fk}
So, I try the swagger UI and submit: GET /companies/4620816365214377730/customers/456
The problem I have is now 2 fold:
It calls the all function on my connector every time - right away, that doesn't make sense. I've given it 2 specific ID's why would it possible want all of anything?
I managed the above and produced the results asked, but then loopback reports a 404:
{
"error": {
"statusCode": 404,
"name": "Error",
"message": "could not find a model with id 4620816365214377730",
"code": "MODEL_NOT_FOUND",
"stack": "Error: could not find a model with id 4620816365214377730"
}
}
So, I definitely don't get it - the first param in callback is the err, and the second is the result. I have literally hardcoded it to be right (I think)
How do I implement simple CRUD? Why does it not call my findById function? I have breakpoints everywhere
const {Connector: connector} = require('loopback-connector')
const util = require("util");
exports.initialize = function initializeDataSource(dataSource, callback) {
dataSource.connector = new QbConnector(dataSource.settings);
dataSource.connector.dataSource = dataSource;
};
exports.QbConnector = QbConnector
function QbConnector(settings, datasource) {
connector.call(this, 'quickbooks', settings)
this.datasource = datasource
this.client = require(`./qb`)(require('./axios'))
}
util.inherits(QbConnector, connector);
// connector.defineAliases(QbConnector.prototype, 'find', 'findById');
QbConnector.prototype.create = function(data, callback) {
console.log()
}
QbConnector.prototype.replaceOrCreate = function(model, data, options, cb) {
console.log()
}
QbConnector.prototype.findOne = function (filter,cb) {
console.log()
}
QbConnector.prototype.all = function(model, filter, callback) {
this.client[model]?.get(filter.where.id)
?.then(data => callback(null,{id: filter.where.id}))
?.catch(e => callback(JSON.stringify(e.response.data,null,4)))
}
QbConnector.prototype.count = function (whereClause,callback) {
console.log()
}
QbConnector.prototype.save = function(model, data, options, cb) {
console.log()
}
QbConnector.prototype.findById = function (id, filter, options) {
console.log()
}
When I step into the callback it's definition is a guaranteed error (the message I am seeing)
(function anonymous(number, plural, select, pluralFuncs, fmt
) {
return function(d) { return "could not find a model with id " + d["0"]; }
})