CUID causes error with custom event handler on CAPM (NodeJS)

[Afsal]

Hi,
I am trying to implement a sample application with custom implementation logic.

schema.cds looks like

 using {
  managed,
  cuid,
  User,
  sap.common.CodeList
} from '@sap/cds/common';
namespace afs.csupport;
....
entity Users : cuid, managed {
  firstName: String;
  lastName: String;
  email: EMailAddress @assert.format : '[\w.]+@[\w.]+';
  phone: PhoneNumber;
  _tickets: Association to many Tickets on _tickets._author = $self;
  _assigned: Association to many Tickets on _assigned._assignedTo = $self;
}
.....

myservice.cds

using {afs.csupport as my} from '../db/schema';
service CustomerService @(path:'/service'){
......
    entity users     as projection on my.Users;
}

so far, POST, GET , DELETE operations works fine when tested in with postman.

but, when I added the myservice.js for testing custom implementation and event handling, the POST request failed and I got the following error in terminal

[odata] - POST /service/users 
[cds] - TypeError: Cannot read properties of undefined (reading 'ID')
    at UriHelper.buildEntityKeys (C:\SAPDevelop\csupport\node_modules\@sap\cds\libx\_runtime\cds-services\adapter\odata-v4\okra\odata-server\utils\UriHelper.js:85:22)
    at ResponseHeaderSetter.setLocationHeader (C:\SAPDevelop\csupport\node_modules\@sap\cds\libx\_runtime\cds-services\adapter\odata-v4\okra\odata-server\core\ResponseHeaderSetter.js:102:17)
    at SetResponseHeadersCommand.execute (C:\SAPDevelop\csupport\node_modules\@sap\cds\libx\_runtime\cds-services\adapter\odata-v4\okra\odata-server\invocation\SetResponseHeadersCommand.js:66:30)
    at CommandExecutor._execute (C:\SAPDevelop\csupport\node_modules\@sap\cds\libx\_runtime\cds-services\adapter\odata-v4\okra\odata-server\invocation\CommandExecutor.js:71:17)
    at C:\SAPDevelop\csupport\node_modules\@sap\cds\libx\_runtime\cds-services\adapter\odata-v4\okra\odata-server\invocation\CommandExecutor.js:81:18      
    at ConditionalRequestControlCommand.execute (C:\SAPDevelop\csupport\node_modules\@sap\cds\libx\_runtime\cds-services\adapter\odata-v4\okra\odata-server\invocation\ConditionalRequestControlCommand.js:48:5)
    at CommandExecutor._execute (C:\SAPDevelop\csupport\node_modules\@sap\cds\libx\_runtime\cds-services\adapter\odata-v4\okra\odata-server\invocation\CommandExecutor.js:71:17)
    at C:\SAPDevelop\csupport\node_modules\@sap\cds\libx\_runtime\cds-services\adapter\odata-v4\okra\odata-server\invocation\CommandExecutor.js:81:18      
    at C:\SAPDevelop\csupport\node_modules\@sap\cds\libx\_runtime\cds-services\adapter\odata-v4\okra\odata-server\invocation\DispatcherCommand.js:88:11    
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5) {
  id: '1591466',
  level: 'ERROR',
  timestamp: 1701164783226
}

myservice.js

const cds = require("@sap/cds/lib");
module.exports = class CustomerService extends cds.ApplicationService {
  init() {
    this.on("CREATE", "ticket", (req, next) => {
      const data = req.data;
      if (data.title.length < 10) return req.reject("The title is too short");
      else return next();
    });
    this.on("READ", "ticket", (req, next) => {
      return next();
    });
    this.on("CREATE", "users", (req, next) => {
      return next();
    });
  }
};

Since the ID field is a cuid that is autogenerated, I am not passing that to the request.
Did I miss anything in the implementation file that supports the database level auto generated field.

here is the payload

{
    "firstName":"Alice",
    "lastName":"Warner",
    "email":"alice@abc.com",
    "phone":"9999548765"
}

[david_kunz2 · Accepted solution]

Hi afsal_a ,

At the end of your `init` method, please add `return super.init()`.

Best regards,
David

[Afsal · Accepted solution]

Thanks david.kunz2 ,
That worked.