eZ\Publish\Core\Persistence\Legacy\Content\FieldValue\Converter\RelationListConverter::toStorageFieldDefinition PHP Method

    public function toStorageFieldDefinition(FieldDefinition $fieldDef, StorageFieldDefinition $storageDef)
    {
        $fieldSettings = $fieldDef->fieldTypeConstraints->fieldSettings;
        $doc = new DOMDocument('1.0', 'utf-8');
        $root = $doc->createElement('related-objects');
        $doc->appendChild($root);
        $constraints = $doc->createElement('constraints');
        if (!empty($fieldSettings['selectionContentTypes'])) {
            foreach ($fieldSettings['selectionContentTypes'] as $typeIdentifier) {
                $allowedClass = $doc->createElement('allowed-class');
                $allowedClass->setAttribute('contentclass-identifier', $typeIdentifier);
                $constraints->appendChild($allowedClass);
                unset($allowedClass);
            }
        }
        $root->appendChild($constraints);
        $type = $doc->createElement('type');
        $type->setAttribute('value', 2);
        //Deprecated advance object relation list type, set since 4.x does
        $root->appendChild($type);
        $objectClass = $doc->createElement('object_class');
        $objectClass->setAttribute('value', '');
        //Deprecated advance object relation class type, set since 4.x does
        $root->appendChild($objectClass);
        $selectionType = $doc->createElement('selection_type');
        if (isset($fieldSettings['selectionMethod'])) {
            $selectionType->setAttribute('value', (int) $fieldSettings['selectionMethod']);
        } else {
            $selectionType->setAttribute('value', 0);
        }
        $root->appendChild($selectionType);
        $defaultLocation = $doc->createElement('contentobject-placement');
        if (!empty($fieldSettings['selectionDefaultLocation'])) {
            $defaultLocation->setAttribute('node-id', (int) $fieldSettings['selectionDefaultLocation']);
        }
        $root->appendChild($defaultLocation);
        $doc->appendChild($root);
        $storageDef->dataText5 = $doc->saveXML();
    }

    /**
     * @group fieldType
     * @group relationlist
     */
    public function testToStorageFieldDefinition()
    {
        $fieldDefinition = new PersistenceFieldDefinition(array('fieldTypeConstraints' => new FieldTypeConstraints(array('fieldSettings' => array('selectionMethod' => Type::SELECTION_BROWSE, 'selectionDefaultLocation' => 12345, 'selectionContentTypes' => array("article", "blog_post"))))));
        $expectedStorageFieldDefinition = new StorageFieldDefinition();
        $expectedStorageFieldDefinition->dataText5 = <<<EOT
<?xml version="1.0" encoding="utf-8"?>
<related-objects><constraints><allowed-class contentclass-identifier="article"/><allowed-class contentclass-identifier="blog_post"/></constraints><type value="2"/><object_class value=""/><selection_type value="0"/><contentobject-placement node-id="12345"/></related-objects>

EOT;
        $actualStorageFieldDefinition = new StorageFieldDefinition();
        $this->converter->toStorageFieldDefinition($fieldDefinition, $actualStorageFieldDefinition);
        $this->assertEquals($expectedStorageFieldDefinition, $actualStorageFieldDefinition);
    }