autoupdate models with loopback lb3 - async trap - promise

Question

I'm just going crazy on this, can some help me please.
Perhaps someone has already solved this properly?
So I have an app with multiple datasources and I want them to autoupdate properly.
Yet I can't believe that I have to do this... Shouldn't it be like a commun thing ?
I put this script in server/boot/20-autoUpdateDb.js
'use strict';
var cluster = require('cluster');
module.exports = function(app, cb) {
if (cluster.isWorker) {
process.nextTick(cb);
} else {
const updateDS = async dataSources => {
await dataSources.forEach(async (ds, key, arr) => {
if (ds.autoupdate) {
console.log('Proceeding with dataSource:', ds.name);
const x = await new Promise(r => {
ds.autoupdate(err => {
if (err) throw err;
console.log(
// 'Auto Updated Models [' + Object.keys(app.models) + ']:',
'Auto Updated Models in',
ds.name,
'(',
ds.adapter.name,
')',
);
r();
});
});
}
});
};
// I just couldn't find a better way as all datasources
// exist in double ex: db,Db
var appDataSources = [
app.dataSources.db,
app.dataSources.dbData,
app.dataSources.dbPool,
];
updateDS(appDataSources).then(() => {
console.log('Autoupdate of all models done.');
process.nextTick(cb);
});
}
};
as output I get
Proceeding with dataSource: db
Proceeding with dataSource: dbData
Proceeding with dataSource: dbPool
Auto Updated Models in dbPool ( sqlite3 )
Autoupdate of all models done.
Web server listening at: http://localhost:3000
Browse your REST API at http://localhost:3000/explorer
Auto Updated Models in dbData ( sqlite3 )
Auto Updated Models in db ( sqlite3 )

Answer 1

Array.prototype.forEach doesn't wait for promises. Try this:
const appDataSources = [
app.dataSources.db,
app.dataSources.dbData,
app.dataSources.dbPool,
]
(async () => {
for (let i = 0; i < appDataSources.length; i++) {
const ds = appDataSources[ i ]
if (ds.autoupdate) {
await new Promise((resolve, reject) => {
ds.autoupdate(err => {
if (err) return reject(err)
resolve()
})
})
}
}
})()