public function postPreference()
{
$preference = Input::get('preference');
$user = Auth::user();
foreach ($preference as $id => $score) {
$userpreference = $user->visualizations()->where('id', $id)->first();
if ($userpreference === null) {
$visualization = \App\Visualization::find($id);
$user->visualizations()->attach($visualization, ['knowledge' => $score]);
} else {
$userpreference->pivot->knowledge = $score;
$userpreference->pivot->save();
$userpreference->save();
}
}
return redirect('home');
}
public function postRating()
{
// save rating
$user = Auth::user();
$visualization = \App\Visualization::where('name', Session::get('visdata')->visualization)->first();
$relation = $user->visualizations()->where('visualization_id', $visualization->id)->first();
if (Input::get('isPositive')) {
// check if already has rating
$relation->pivot->rating = 1;
$relation->pivot->save();
$relation->save();
} else {
$relation->pivot->rating = 0;
$relation->pivot->save();
$relation->save();
}
}
public function generateUserRating($visualizationid, $neighbors, $minVisRating)
{
$visualizationVectors = $this->generateVectors();
$vectors = [];
$vector = $visualizationVectors[$visualizationid - 1];
for ($i = 1; $i <= count($visualizationVectors); $i++) {
if (count(Visualization::all()[$i - 1]->users) >= $minVisRating) {
$similaritem = (object) [];
if ($i == $visualizationid) {
} else {
$similaritem->similarity = $this->vectorSimilarity($vector, $visualizationVectors[$i]);
$similaritem->visualization = $i;
$vectors[] = $similaritem;
}
} else {
// skip if the visualization does not have enough rating by the users
}
}
// sort mapping
usort($vectors, array("App\\Http\\Controllers\\RatingController", "compareSimilarity"));
$similaritems = [];
for ($i = 0; $i < $neighbors && $i < count($vectors); $i++) {
$similaritems[] = $vectors[$i];
}
if (count($similaritems) === 0) {
return null;
} else {
return $this->generatePrediction($similaritems, $visualizationVectors);
}
}
