I have a problem in my Symfony 6.4 when I upgrade Doctrine/orm from 2.2 to 3.0. The error says:

DoctrineORMMappingDefaultQuoteStrategy::getColumnName(): Return value must be of type string, null returned

I know that is something about “object API of FieldMapping”, because my fieldMapping is an array as the 2.2 version, but no an object as supuse to be in 3.0 version.

My doctrine config is:

doctrine:
dbal:
    url: '%env(resolve:DATABASE_URL)%'
    server_version: '8.0.36'

    profiling_collect_backtrace: '%kernel.debug%'
    use_savepoints: true
    types:
        map_config: 'GameMapInfrastructurePersistenceDoctrineDBALTypesMapConfigJsonType'
        group_config: 'GameMapInfrastructurePersistenceDoctrineDBALTypesGroupConfigJsonType'
        poi_media_type: 'GameMapInfrastructurePersistenceDoctrineDBALTypesPoiMediaTypeStringType'
        datetime_immutable_utc: 'GameMapInfrastructurePersistenceDoctrineDBALTypesUtcDateTimeType'

orm:
    auto_generate_proxy_classes: true
    enable_lazy_ghost_objects: true
    report_fields_where_declared: true
    validate_xml_mapping: true
    naming_strategy: doctrine.orm.naming_strategy.underscore_number_aware
    auto_mapping: true
    mappings:
        GameMap:
            type: attribute
            is_bundle: false
            dir: '%kernel.project_dir%/src/Domain/Entity'
            prefix: 'GameMapDomainEntity'
            alias: GameMap
    controller_resolver:
      auto_mapping: true
    filters:
        deleted:
            class: 'GameMapInfrastructurePersistenceDoctrineFilterDeletedFilter'
            enabled: true

Thanks a lot!!