BelongsTo in Sails.js - sails.js

Question

Hello, I need your help please with 2 questions.
I have 2 Models
One to Many
(One) Customer{ id, names, dni} -> Invoice {id, date, ....customer_id} (Many)
1. How can I get this?
I need to consume the api "GET /api/invoices" and that the json return of this, in turn, returns an array
[{
id: 1,
date: '2022-01-01',
....invoice
customer: {
dni: 1,
names: 'Example'
}
},
{
id: 2,
date: '2022-01-02',
....invoice
customer: {
dni: 2,
names: 'Example 2'
}
},
]
So far what I have found in the sailsjs documentation are only examples with POPULATE, where they only show how to list the User model with its corresponding created ones (hasMany)
//var users = await User.find().populate('pets');
// The users object would look something like the following
// [{
// id: 123,
// firstName: 'Foo',
// lastName: 'Bar',
// pets: [{
// id: 1,
// breed: 'labrador',
// type: 'dog',
// name: 'fido',
// user: 123
// }]
// }]
//---This is not what I need.
Is there a function or configuration that I have not found?
Or would I do something like this?
Invoices.find().exec(async(err, invoices)=>{
if(invoices){
for(i = 0; i< invoices.length; i++){
const customer = await Customer.find({id: invoices[i].customer_id});
invoices[i].customer = customer;
}
});
The point is that this takes much longer than doing a query with join
const invoices = await sails.sendNativeQuery('SELECT * from INVOICE A A inner join CUSTOMER B on A.customer_id=B.id ', []);
But I don't know how to get a JSON with the previous structure if I do it by query
2. What is the best option that can solve my problem?

Answer 1

The populate method works in both directions: oneToMany, manyToMany, and manyToOne:
https://sailsjs.com/documentation/reference/waterline-orm/queries/populate
If any condition is required, you could check the details on the section Populating a collection association:
var usersNamedFinn = await User.find({ name:'Finn' })
.populate('currentSwords', {
where: {
color: 'purple'
},
limit: 3,
sort: 'hipness DESC'
});