SAP CAP using cds.User attributes - odata

Question

I authenticate on the server by feeding req.user with an instance of cds.User, and I add some attributes:
User {
id: '110226363079182595683',
attr: { name: 'depth1', email: 'depth1#protonmail.com' },
_roles: { 'identified-user': true, 'authenticated-user': true }
}
This allows me to call my CDS services with an authenticated user.
It works well.
Then, I have in my CDS schema an entity :
entity Comments {
key ID : Integer;
project : Association to Projects;
title : String;
text : String;
CreatedBy : String #cds.on.insert : $user;
CreatedByName : String #cds.on.insert : $user.name;
}
My schema on an SQLite database.
I start the server, I launch a UI5 application which allows to insert comments in OData V4 and here is what happens:
HTTP request:
--batch_id-1642708209182-45
Content-Type:application/http
Content-Transfer-Encoding:binary
POST Projects(1)/comments HTTP/1.1
Accept:application/json;odata.metadata=minimal;IEEE754Compatible=true
Accept-Language:fr-FR
Content-Type:application/json;charset=UTF-8;IEEE754Compatible=true
{"ID":0,"text":"test comment"}
--batch_id-1642708209182-45--
Group ID: $auto
Server Log:
[cds] - > CREATE Projects(1)/comments
HTTP Response:
--batch_id-1642708209182-45
content-type: application/http
content-transfer-encoding: binary
HTTP/1.1 201 Created
odata-version: 4.0
content-type: application/json;odata.metadata=minimal;IEEE754Compatible=true
location: Comments(101)
{"#odata.context":"../$metadata#Comments/$entity","ID":101,"project_ID":1,"title":null,"text":"test comment","CreatedBy":"110226363079182595683","CreatedByName":"depth1"}
--batch_id-1642708209182-45--
HTTP Request:
--batch_id-1642708209355-46
Content-Type:application/http
Content-Transfer-Encoding:binary
GET Projects(1)/comments(101)?$select=CreatedByName,ID,text HTTP/1.1
Accept:application/json;odata.metadata=minimal;IEEE754Compatible=true
Accept-Language:fr-FR
Content-Type:application/json;charset=UTF-8;IEEE754Compatible=true
--batch_id-1642708209355-46--
Group ID: $auto
Server log
[cds] - > READ Projects(1)/comments(101) { '$select': 'CreatedByName,ID,text' }
HTTP Response
--batch_id-1642708209355-46
content-type: application/http
content-transfer-encoding: binary
HTTP/1.1 200 OK
odata-version: 4.0
content-type: application/json;odata.metadata=minimal;IEEE754Compatible=true
{"#odata.context":"../$metadata#Comments(CreatedByName,ID,text)/$entity","CreatedByName":null,"ID":101,"text":"aaa"}
--batch_id-1642708209355-46--
In my Database, CreatedBy is filled but not CreatedByName.
Also in the Create request i got the CreatedByName filled by the server and returned it's really strange.
How can i insert some cds.User attributes to the database ?!
Thank you !

Answer 1

Oww
I found a solution ! By adding a behavior in service.js
const cds = require('#sap/cds')
module.exports = cds.service.impl(function() {
this.before('CREATE', 'Comments', fillData)
})
async function fillData(req) {
req.data.CreatedByName = req.user.attr.name;
}