Symfony Doctrine not working when uses "SEQUENCE" as GeneratedValue in Oracle - oracle

Question

I have the following Entity in Symfony 2 with an ID generated by an Oracle Sequence:
namespace PSBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Table(name="CONTRATO")
* #ORM\Entity
* #ORM\Entity(repositoryClass="PSBundle\Entity\ContratoRepository")
*/
class Contrato
{
/**
* #var integer
*
* #ORM\Column(name="ID_CONTRATO", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="SEQUENCE")
* #ORM\SequenceGenerator(sequenceName="SID_CONTRATO", allocationSize=1, initialValue=1)
*/
private $idContrato;
// Other fields...
}
But when I do:
$entityContrato = new Contrato();
// Set some fields
$em->persist($entityContrato);
I get:
Entity of type PSBundle\Entity\Contrato is missing an assigned ID for
field 'idContrato'. The identifier generation strategy for this
entity requires the ID field to be populated before
EntityManager#persist() is called. If you want automatically generated
identifiers instead you need to adjust the metadata mapping
accordingly.
I know that SID_CONTRATO is well defined as if I select the NEXTVAL it works:
What I'm missing? Any kind of light in the subject would be more than appreciated, my related dependencies are:
"php": "7.2",
"symfony/symfony": "2.3.42",
"doctrine/orm": "2.3.x-dev",
"doctrine/doctrine-bundle": "1.2.0",
Doctrine config (from config/config.yml, I don't have a doctrine.yaml file):
# Doctrine Configuration
doctrine:
dbal:
driver: oci8
port: 1521
dbname: ORCL
host: %dbal_host%
user: %dbal_user%
password: %dbal_pass%
charset: UTF8
memory: true
logging: true
orm:
auto_generate_proxy_classes: %kernel.debug%
auto_mapping: true
# IMPORTANT: this fixes bugs with the date format that is brought from Oracle ('d/m/y')
# The problem is described here: https://stackoverflow.com/questions/37723240/symfony-doctrine-oracle-datetime-format-issue
services:
oracle.listener:
class: Doctrine\DBAL\Event\Listeners\OracleSessionInit
tags:
- { name: doctrine.event_listener, event: postConnect }

Answer 1

Ok, I found the problem:
If I do a var_dump() in doctrine\orm\lib\Doctrine\ORM\UnitOfWork.php of $class->idGenerator it outputs:
object(Doctrine\ORM\Id\AssignedGenerator)
While if I do the same with entities that currently work with sequences they output:
object(Doctrine\ORM\Id\SequenceGenerator)...
So Symfony wasn't getting the correct type of Generator. I check the entity file and found out that there was some fields with #ORM\GeneratedValue(strategy="NONE"), eg.:
/**
* #var integer
*
* #ORM\Column(name="ID_CONTRATO", type="integer", nullable=false)
* #ORM\Id
* #ORM\GeneratedValue(strategy="SEQUENCE")
* #ORM\SequenceGenerator(sequenceName="SID_CONTRATO", allocationSize=1, initialValue=1)
*/
private $idContrato;
/**
* #var string
*
* #ORM\Column(name="TIPO", type="string", length=1, nullable=false)
* #ORM\GeneratedValue(strategy="NONE") // This was the conflicting line
*/
private $tipo;
Apparently, Symfony gets the last #ORM\GeneratedValue definition as the class identifier generator, which in this case had the strategy="NONE" so It couldn't get the next value from the sequence.