How to joined 2 tables and output fields from the adjacent table? - node.js

Question

everybody, could you please tell me
I use the objection.js (ORM) library for knex.js
joined Users and Roles tables, everything is great.
I use it:
const users = await User.query().eager().roles')
I'm getting it:
{"id":1, "email": "ann#mail.com", "password": "qwe", "role":1, "roles":{"id":1, "name": "admin"}}
But how can I get a flat structure? :
{"id":1, "email": "ann#mail.com", "password": "qwe", "role "admin"}

Answer 1

I would normally expect Objection to do this with a HasOneRelation relationship, so I'm going to assume that's what you have here:
{
"id": 1,
"email": "ann#mail.com",
"password": "qwe",
"role": 1,
"roles": {
"id":1,
"name": "admin"
}
}
If your users can only have one role at a time, that should be fine. To get a flat structure, you can either post-process it in JavaScript:
return {
...user,
role: roles.name
}
or create a virtual attribute:
export default class User extends Model {
static get virtualAttributes() {
return ['roleName'];
}
roleName() {
return this.roles.name;
}
// ...
}
This will not stop the roles object from being added, but it'll provide a first-level alias for the name in the JSON.