getAffectedSetNulls example

/** * @param array<mixed> $resolved */
    private function addSetNullOnDeletesCommands(WriteCommandQueue $queue, EntityDefinition $definition, WriteContext $writeContext, array $resolved): void
    {
        if ($definition instanceof MappingEntityDefinition) {
            return;
        }

        $setNullFields = $definition->getFields()->filterByFlag(SetNullOnDelete::class);

        $setNulls = $this->foreignKeyResolver->getAffectedSetNulls($definition, $resolved, $writeContext->getContext());

        foreach ($setNulls as $affectedDefinitionClass => $restrictions) {
            [$entity, $field] = explode('.', $affectedDefinitionClass);

            $affectedDefinition = $this->registry->getByEntityName($entity);

            /** @var AssociationField $associationField */
            $associationField = $setNullFields
                ->filter(fn (Field $setNullField) => $setNullField instanceof AssociationField && $setNullField->getReferenceField() === $field)
                ->first();