/**
* Saves the course
* @param Course $c
* @param array $tags
*/
public function saveCourseTags(Course $c, array $tags)
{
$newTag = false;
$tagsToBeRemoved = array();
// Get existing tags for this course
$ct = array();
foreach ($c->getTags() as $cTag) {
$tName = $cTag->getName();
$ct[] = $tName;
if (!in_array($tName, $tags)) {
$tagsToBeRemoved[] = $cTag;
}
}
foreach ($tagsToBeRemoved as $tr) {
$c->removeTag($tr);
}
// Create new tags if necessary
foreach ($tags as $tag) {
if (in_array($tag, $ct)) {
// nothing to do here
continue;
}
// Check if the tag exists
$t = $this->em->getRepository('ClassCentralSiteBundle:Tag')->findOneBy(array('name' => $tag));
if (!$t) {
$newTag = true;
$t = new \ClassCentral\SiteBundle\Entity\Tag();
$t->setName($tag);
$this->em->persist($t);
}
$c->addTag($t);
}
$this->em->persist($c);
$this->em->flush();
// Flush the tag cache if a new tag was created
if ($newTag) {
$this->cache->deleteCache(self::ALL_TAGS_CACHE_KEY);
}
}
