Using FAL in Extbase correctly - typo3

Question

Domain model
class Image extends AbstractContent {
/**
* #var \TYPO3\CMS\Extbase\Domain\Model\FileReference
*/
protected $file;
/**
* Gets the image file
*
* #return \TYPO3\CMS\Extbase\Domain\Model\FileReference
*/
public function getFile() {
return $this->file;
}
/**
* Sets the image file
*
* #param \TYPO3\CMS\Extbase\Domain\Model\FileReference $file
* #return void
*/
public function setFile($file) {
$this->file = $file;
}
}
Import service fragments
/**
* #var \TYPO3\CMS\Core\Resource\ResourceStorage
*/
protected $defaultStorage;
[...]
$this->defaultStorage = ResourceFactory::getInstance()->getDefaultStorage();
[...]
$file = $this->defaultStorage->addFile(
'/tmp/4711',
$this->defaultStorage->getRootLevelFolder(),
'foo.jpg',
'overrideExistingFile'
);
$falReference = ResourceFactory::getInstance()->createFileReferenceObject(
array(
'uid_local' => $file->getUid(),
'uid_foreign' => uniqid('NEW_'),
'uid' => uniqid('NEW_'),
)
);
$reference = GeneralUtility::makeInstance(FileReference::class);
$reference->setOriginalResource($falReference);
$content = GeneralUtility::makeInstance(Image::class);
$content->setFile($reference);
After saving $content the image is available through the record and the filemount but the Ref column in BE > FILE > File List) is - and not >= 1. So its look like the reference is some how broken. When I'm using the BE to add an image to the record it's all fine. I'm using TYPO3 CMS 7.3-dev.
What's wrong with my code?

Answer 1

I get the hint in the Slack channel of TYPO3.
You just need to set plugin.tx_myext.persistence.updateReferenceIndex = 1 respectively module.tx_myext.persistence.updateReferenceIndex = 1 and the index will be updated.
Alternatively you could use \TYPO3\CMS\Core\Database\ReferenceIndex::updateRefIndexTable().

Answer 2

When I had to use FAL in my extension I found this link:
http://t3-developer.com/extbase-fluid/extensions-erweitern/fal-in-eigenen-extensions/fal-in-typo3-extensions-verwenden/
Since it is in German, I will in the very shortest explain what is done there:
extend your data model in ext_tables.sql
add a column of some char type (e.g. varchar)
add your column to the column section in your TCA array in ext_tables.php
'mypictures' => array(
'exclude' => 1,
'label' => 'My Pictures',
'config' => \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::getFileFieldTCAConfig('image', array(
'appearance' => array(
'createNewRelationLinkTitle' => 'LLL:EXT:cms/locallang_ttc.xlf:images.addFileReference'
),
'minitems' => 0,
'maxitems' => 99,
), $GLOBALS['TYPO3_CONF_VARS']['GFX']['imagefile_ext']),
),
Extend your modelfiles. Pay attention to annotations!
You can use your media in your fluid template