/**
*
* @param integer|Model_Page_Front $page_id
* @param array $tags
*/
public static function save_by_page($page_id, $tags)
{
if (is_string($tags)) {
$tags = explode(Model_Tag::SEPARATOR, $tags);
}
$tags = array_unique(array_map('trim', $tags));
$current_tags = Model_Page_Tag::find_by_page($page_id);
if ($page_id instanceof Model_Page_Front) {
$page_id = $page_id->id();
}
// no tag before! no tag now! ... nothing to do!
if (empty($tags) and empty($current_tags)) {
return NULL;
}
// delete all tags
if (empty($tags)) {
// update count (-1) of those tags
foreach ($current_tags as $tag) {
DB::update(Model_Tag::tableName())->set(array('count' => DB::expr('count - 1')))->where('name', '=', $tag)->execute();
}
Record::deleteWhere(self::tableName(), array('where' => array(array('page_id', '=', (int) $page_id))));
Cache::instance()->delete_tag('page_tags');
} else {
$old_tags = array_diff($current_tags, $tags);
$new_tags = array_diff($tags, $current_tags);
// insert all tags in the tag table and then populate the page_tag table
foreach ($new_tags as $index => $tag_name) {
if (empty($tag_name)) {
continue;
}
$tag = Record::findOneFrom('Model_Tag', array('where' => array(array('name', '=', $tag_name))));
// try to get it from tag list, if not we add it to the list
if (!$tag instanceof Model_Tag) {
$tag = new Model_Tag(array('name' => trim($tag_name)));
}
$tag->count++;
$tag->save();
// create the relation between the page and the tag
$page_tag = new Model_Page_Tag(array('page_id' => (int) $page_id, 'tag_id' => $tag->id));
$page_tag->save();
}
// remove all old tag
foreach ($old_tags as $index => $tag_name) {
// get the id of the tag
$tag = Record::findOneFrom('Model_Tag', array('where' => array(array('name', '=', $tag_name))));
Record::deleteWhere(self::tableName(), array('where' => array(array('page_id', '=', (int) $page_id), array('tag_id', '=', $tag->id))));
$tag->count--;
$tag->save();
}
Cache::instance()->delete_tag('page_tags');
}
}
