yager-api/modules/v1/models/EventoAccion.php

<?php

namespace v1\models;

use app\models\EventoAccion as ModelsEventoAccion;

class EventoAccion extends ModelsEventoAccion {

  public function fields() { 
    return [
      'idEvento',
      'accion',
    ];
  }

  public function extraFields() { 
    return [
      'evento'
    ];
  }
  
  public function getEvento() {
    return $this->hasOne(Evento::class, ['id' => 'idEvento']);
  }
}