static function getSuggestions($userId = -1)
{
global $configArray;
if ($userId == -1) {
global $user;
$userId = $user->id;
}
//Load all titles the user is not interested in
$notInterestedTitles = array();
$notInterested = new NotInterested();
$resource = new Resource();
$notInterested->joinAdd($resource);
$notInterested->userId = $userId;
$notInterested->find();
while ($notInterested->fetch()) {
if ($notInterested->source == 'VuFind') {
$fullId = $notInterested->record_id;
} else {
$fullId = 'econtentRecord' . $notInterested->record_id;
}
$notInterestedTitles[$fullId] = $fullId;
}
//Load all titles the user has rated (print)
$allRatedTitles = array();
$allLikedRatedTitles = array();
$ratings = new UserRating();
$ratings->userid = $userId;
$resource = new Resource();
$notInterested->joinAdd($resource);
$ratings->joinAdd($resource);
$ratings->find();
while ($ratings->fetch()) {
$allRatedTitles[$ratings->record_id] = $ratings->record_id;
if ($ratings->rating >= 4) {
$allLikedRatedTitles[] = $ratings->record_id;
}
}
//Load all titles the user has rated (eContent)
$econtentRatings = new EContentRating();
$econtentRatings->userId = $userId;
$econtentRatings->find();
while ($econtentRatings->fetch()) {
$allRatedTitles['econtentRecord' . $econtentRatings->recordId] = 'econtentRecord' . $econtentRatings->recordId;
if ($econtentRatings->rating >= 4) {
$allLikedRatedTitles[] = 'econtentRecord' . $econtentRatings->recordId;
}
}
// Setup Search Engine Connection
$class = $configArray['Index']['engine'];
$url = $configArray['Index']['url'];
$db = new $class($url);
if ($configArray['System']['debugSolr']) {
$db->debug = true;
}
//Get a list of all titles the user has rated (3 star and above)
$ratings = new UserRating();
$ratings->whereAdd("userId = {$userId}", 'AND');
$ratings->whereAdd('rating >= 3', 'AND');
$ratings->orderBy('rating DESC, dateRated DESC, id DESC');
//Use the 20 highest ratings to make real-time recommendations faster
$ratings->limit(0, 5);
$ratings->find();
$suggestions = array();
//echo("User has rated {$ratings->N} titles<br/>");
if ($ratings->N > 0) {
while ($ratings->fetch()) {
$resourceId = $ratings->resourceid;
//Load the resource
$resource = new Resource();
$resource->id = $resourceId;
$resource->find();
if ($resource->N != 1) {
//echo("Did not find resource for $resourceId<br/>");
} else {
$resource->fetch();
//echo("Found resource for $resourceId - {$resource->title}<br/>");
$ratedTitles[$resource->record_id] = clone $ratings;
$numRecommendations = 0;
if ($resource->isbn) {
//If there is an isbn for the title, we can load similar titles based on Novelist.
$isbn = $resource->isbn;
$numRecommendations = Suggestions::getNovelistRecommendations($ratings, $isbn, $resource, $allRatedTitles, $suggestions, $notInterestedTitles);
//echo(" - Found $numRecommendations for $isbn from Novelist<br/>");
}
if ($numRecommendations == 0) {
Suggestions::getSimilarlyRatedTitles($db, $ratings, $userId, $allRatedTitles, $suggestions, $notInterestedTitles);
//echo(" - Found $numRecommendations based on ratings from other users<br/>");
}
}
}
}
//Also get eContent the user has rated highly
$econtentRatings = new EContentRating();
$econtentRatings->userId = $userId;
$econtentRatings->whereAdd('rating >= 3');
$econtentRatings->orderBy('rating DESC, dateRated DESC');
$econtentRatings->limit(0, 5);
$econtentRatings->find();
//echo("User has rated {$econtentRatings->N} econtent titles<br/>");
if ($econtentRatings->N > 0) {
while ($econtentRatings->fetch()) {
//echo("Processing eContent Rating {$econtentRatings->recordId}<br/>");
//Load the resource
$resource = new Resource();
$resource->record_id = $econtentRatings->recordId;
$resource->source = 'eContent';
$resource->find();
if ($resource->N != 1) {
//echo("Did not find resource for $resourceId<br/>");
} else {
$resource->fetch();
//echo("Found resource for $resourceId - {$resource->title}<br/>");
$ratedTitles[$resource->record_id] = clone $econtentRatings;
$numRecommendations = 0;
if ($resource->isbn) {
//If there is an isbn for the title, we can load similar titles based on Novelist.
$isbn = $resource->isbn;
$numRecommendations = Suggestions::getNovelistRecommendations($ratings, $isbn, $resource, $allRatedTitles, $suggestions, $notInterestedTitles);
//echo(" - Found $numRecommendations for $isbn from Novelist<br/>");
}
if ($numRecommendations == 0) {
Suggestions::getSimilarlyRatedTitles($db, $ratings, $userId, $allRatedTitles, $suggestions, $notInterestedTitles);
//echo(" - Found $numRecommendations based on ratings from other users<br/>");
}
}
}
}
$groupedTitles = array();
foreach ($suggestions as $suggestion) {
$groupingTerm = $suggestion['titleInfo']['grouping_term'];
$groupedTitles[] = $groupingTerm;
}
//If the user has not rated anything, return nothing.
if (count($allLikedRatedTitles) == 0) {
return array();
}
//Get recommendations based on everything I've rated using more like this functionality
$class = $configArray['Index']['engine'];
$url = $configArray['Index']['url'];
/** @var Solr $db */
$db = new $class($url);
//$db->debug = true;
$moreLikeTheseSuggestions = $db->getMoreLikeThese($allLikedRatedTitles);
//print_r($moreLikeTheseSuggestions);
if (count($suggestions) < 30) {
foreach ($moreLikeTheseSuggestions['response']['docs'] as $suggestion) {
$groupingTerm = $suggestion['grouping_term'];
if (array_key_exists($groupingTerm, $groupedTitles)) {
//echo ($suggestion['grouping_term'] . " is already in the suggestions");
continue;
}
$groupedTitles[$groupingTerm] = $groupingTerm;
//print_r($suggestion);
if (!array_key_exists($suggestion['id'], $allRatedTitles) && !array_key_exists($suggestion['id'], $notInterestedTitles)) {
$suggestions[$suggestion['id']] = array('rating' => $suggestion['rating'] - 2.5, 'titleInfo' => $suggestion, 'basedOn' => 'MetaData for all titles rated');
}
if (count($suggestions) == 30) {
break;
}
}
}
//print_r($groupedTitles);
//sort suggestions based on score from ascending to descending
uasort($suggestions, 'Suggestions::compareSuggestions');
//Only return up to 50 suggestions to make the page size reasonable
$suggestions = array_slice($suggestions, 0, 30, true);
//Return suggestions for use in the user interface.
return $suggestions;
}
