public function apply($contentId)
{
$versionNumbers = $this->contentGateway->listVersionNumbers($contentId);
$fieldIdSet = array();
$nameRows = $this->contentGateway->loadVersionedNameData(array_map(function ($versionNo) use($contentId) {
return array('id' => $contentId, 'version' => $versionNo);
}, $versionNumbers));
foreach ($versionNumbers as $versionNo) {
$contentRows = $this->contentGateway->load($contentId, $versionNo);
$contentList = $this->contentMapper->extractContentFromRows($contentRows, $nameRows);
$content = $contentList[0];
$versionFieldIdSet = array();
foreach ($content->fields as $field) {
if ($field->fieldDefinitionId == $this->fieldDefinition->id) {
$fieldIdSet[$field->id] = true;
$versionFieldIdSet[$field->id] = true;
}
}
// Delete from external storage with list of IDs per version
$this->storageHandler->deleteFieldData($this->fieldDefinition->fieldType, $content->versionInfo, array_keys($versionFieldIdSet));
}
// Delete from internal storage -- field is always deleted from _all_ versions
foreach (array_keys($fieldIdSet) as $fieldId) {
$this->contentGateway->deleteField($fieldId);
}
}