Best way to fetch data from many tables in node.js - mysql

Question

If I have a view in my (mvc project) contains data from many tables in the database, what is the best way to fetch them without getting into the nested tree of doom
Model1.findAll().then(model1Data => {
Model2.findAll().then(model2Data => {
Model3.findAll().then(model3Data => {
Modeln.findAll().then(modelnData => {
res.render('view', {
model1Data: model1Data,
model2Data: model2Data,
model3Data: model3Data,
modelnData: modelnData
});
})
})
})
})
Note: the above query has no where clauses, joins, or any other conditions

Answer 1

Here you can use 2 ways either Promise.all() or async/await :
Promise.all() :
const promises = [
Model1.findAll(),
Model2.findAll(),
Model3.findAll(),
Modeln.findAll()
]
Promise.all(promises).then((data) => {
res.render('view', data );
});
Async/await :
let model1Data = await Model1.findAll();
let model2Data = await Model2.findAll();
let model3Data = await Model3.findAll();
let modelnData = await Modeln.findAll();
res.render('view', {
model1Data: model1Data,
model2Data: model2Data,
model3Data: model3Data,
modelnData: modelnData
});
NOTE :
I would suggest to use Promise.all() if the queries are not dependent
on each other , as it will start execution and don't wait for the
first one to complete as it does in async/await.
For More Deatil : DO READ